diff --git a/public/mod/subsection/cleandescriptions.php b/public/mod/subsection/cleandescriptions.php
new file mode 100644
index 00000000000..f5170e0323a
--- /dev/null
+++ b/public/mod/subsection/cleandescriptions.php
@@ -0,0 +1,52 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Remove or migrate subsection descriptions
+ *
+ * @copyright 2026 Sara Arjona <sara@moodle.com>
+ * @package   mod_subsection
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once('../../config.php');
+
+require_admin();
+
+$action = required_param('action', PARAM_ALPHA);
+$count = optional_param('count', 0, PARAM_INT);
+$return = new moodle_url('/admin/settings.php', ['section' => 'mod_subsection_settings']);
+
+$PAGE->set_url('/mod/subsection/cleandescriptions.php');
+$PAGE->set_context(context_system::instance());
+
+require_sesskey();
+if ($action === 'delete') {
+    // Remove all existing subsection descriptions.
+    $DB->set_field('course_sections', 'summary', '', ['component' => 'mod_subsection']);
+    redirect(
+        $return,
+        get_string('descriptionsdeletedsuccess', 'mod_subsection', $count),
+        null,
+        \core\output\notification::NOTIFY_SUCCESS
+    );
+} else if ($action === 'migrate') {
+    // Schedule the ad-hoc task to migrate subsection descriptions.
+    \core\task\manager::queue_adhoc_task(new \mod_subsection\task\migrate_subsection_descriptions_task(), true);
+    redirect($return);
+} else {
+    throw new moodle_exception('invalidaction', 'mod_subsection');
+}
diff --git a/public/mod/subsection/lang/en/subsection.php b/public/mod/subsection/lang/en/subsection.php
index 3893fbe662a..b82aff3bd7a 100644
--- a/public/mod/subsection/lang/en/subsection.php
+++ b/public/mod/subsection/lang/en/subsection.php
@@ -23,6 +23,28 @@
  * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+$string['cleandescriptionsdetail'] = 'Subsection pages and descriptions are no longer supported in Moodle 5.2.
+<p>This site has <strong>{$a->count} subsection descriptions</strong> that are no longer visible to users.</p>
+<p>You can choose to:
+<ul>
+  <li><strong>Migrate these descriptions to Text and Media areas</strong>.<br/> The Text and media areas will be displayed at the top of each subsection.<br/>{$a->migratelink}<br/><br/>
+  </li>
+  <li><strong>Delete these descriptions permanently</strong>.<br/> This will completely erase descriptions from the database.<br/>{$a->deletelink}
+  </li>
+</ul>
+</p>';
+$string['deleteconfirmbutton'] = 'Delete all descriptions';
+$string['deleteconfirmtext'] = 'This will permanently delete {$a} subsection descriptions from the database.<br/><br/>You can\'t undo this. Are you sure you want to delete all descriptions?';
+$string['deleteconfirmtitle'] = 'Delete all subsection descriptions?';
+$string['deletelinktext'] = 'Delete descriptions';
+$string['descriptionsdeletedsuccess'] = '{$a} subsection descriptions deleted.';
+$string['descriptionsmigratedpending'] = 'Subsection descriptions waiting to be migrated: <strong>{$a}</strong>';
+$string['descriptionsmigratedsuccess'] = '<strong>The migration task for all subsection descriptions has been created</strong>. This task will run in the background and may take a few minutes.';
+$string['invalidaction'] = 'Invalid action specified.';
+$string['migrateconfirmbutton'] = 'Migrate all descriptions';
+$string['migrateconfirmtext'] = 'This will migrate {$a} subsection descriptions to Text and Media areas.<br/><br/>You can\'t undo this. Are you sure you want to migrate all descriptions?';
+$string['migrateconfirmtitle'] = 'Migrate all subsection descriptions?';
+$string['migratelinktext'] = 'Migrate descriptions';
 $string['modulename'] = 'Subsection';
 $string['modulenameplural'] = 'Subsections';
 $string['pluginadministration'] = 'Subsection administration';
diff --git a/public/mod/subsection/settings.php b/public/mod/subsection/settings.php
index 9025c8122d6..41ef83e9d16 100644
--- a/public/mod/subsection/settings.php
+++ b/public/mod/subsection/settings.php
@@ -28,7 +28,78 @@ defined('MOODLE_INTERNAL') || die();
 if ($hassiteconfig) {
     $settings = new admin_settingpage('mod_subsection_settings', new lang_string('pluginname', 'mod_subsection'));
 
-    // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedIf
     if ($ADMIN->fulltree) {
+        // Add description cleanup and migration links.
+        $count = $DB->count_records_select(
+            table: 'course_sections',
+            select: 'component = :component AND summary != :empty',
+            params: ['component' => 'mod_subsection', 'empty' => ''],
+        );
+        $task = \core\task\manager::get_queued_adhoc_task_record(new \mod_subsection\task\migrate_subsection_descriptions_task());
+        if ($task) {
+            // There is a pending migration task, show notification and pending count.
+            $notification = $OUTPUT->notification(
+                get_string('descriptionsmigratedsuccess', 'mod_subsection'),
+                \core\output\notification::NOTIFY_SUCCESS,
+            );
+            $settings->add(new admin_setting_heading(
+                'migratedescriptionsnotification',
+                '',
+                $notification,
+            ));
+            $settings->add(new admin_setting_heading(
+                'pendingcleandescriptions',
+                '',
+                new lang_string('descriptionsmigratedpending', 'mod_subsection', $count),
+            ));
+        } else if ($count > 0) {
+            // Show migration and deletion links.
+            $migrateaction = new \confirm_action(
+                message: get_string('migrateconfirmtext', 'mod_subsection', $count),
+                continuelabel: get_string('migrateconfirmbutton', 'mod_subsection'),
+                title: get_string('migrateconfirmtitle', 'mod_subsection'),
+            );
+            $migrateurl = new moodle_url(
+                '/mod/subsection/cleandescriptions.php',
+                ['action' => 'migrate', 'count' => $count, 'sesskey' => sesskey()],
+            );
+            $migratelink = $OUTPUT->action_link(
+                url: $migrateurl,
+                text: get_string('migratelinktext', 'mod_subsection'),
+                action: $migrateaction,
+                attributes: ['class' => 'btn btn-secondary'],
+            );
+
+            $deleteaction = new \confirm_action(
+                message: get_string('deleteconfirmtext', 'mod_subsection', $count),
+                continuelabel: get_string('deleteconfirmbutton', 'mod_subsection'),
+                title: get_string('deleteconfirmtitle', 'mod_subsection'),
+                dialogtype: 'delete',
+            );
+            $deleteurl = new moodle_url(
+                '/mod/subsection/cleandescriptions.php',
+                ['action' => 'delete', 'count' => $count, 'sesskey' => sesskey()],
+            );
+            $deletelink = $OUTPUT->action_link(
+                url: $deleteurl,
+                text: get_string('deletelinktext', 'mod_subsection'),
+                action: $deleteaction,
+                attributes: ['class' => 'btn btn-secondary'],
+            );
+
+            $settings->add(new admin_setting_heading(
+                'cleandescriptions',
+                '',
+                new lang_string(
+                    'cleandescriptionsdetail',
+                    'mod_subsection',
+                    [
+                        'count' => $count,
+                        'migratelink' => $migratelink,
+                        'deletelink' => $deletelink,
+                    ],
+                ),
+            ));
+        }
     }
 }
diff --git a/public/mod/subsection/tests/behat/subsection_clean_descriptions.feature b/public/mod/subsection/tests/behat/subsection_clean_descriptions.feature
new file mode 100644
index 00000000000..7aa8f8ad2c8
--- /dev/null
+++ b/public/mod/subsection/tests/behat/subsection_clean_descriptions.feature
@@ -0,0 +1,46 @@
+@mod @mod_subsection @_file_upload
+Feature: Subsection clean descriptions
+  In order to manage subsection descriptions
+  As an administrator
+  I want to be able to delete or migrate subsection descriptions
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | category |
+      | Course 1 | C1        | 0        |
+    And the following config values are set as admin:
+      | enableasyncbackup | 0 |
+    And I am on the "Course 1" "restore" page logged in as "admin"
+    And I press "Manage course backups"
+    And I upload "mod/subsection/tests/fixtures/subsections_with_descriptions.mbz" file to "Files" filemanager
+    And I press "Save changes"
+    And I restore "subsections_with_descriptions.mbz" backup into a new course using this options:
+      | Schema | Course name       | Course 2 |
+      | Schema | Course short name | C2       |
+
+  @javascript
+  Scenario: Migrate subsection descriptions
+    Given I navigate to "Plugins > Activity modules > Subsection" in site administration
+    And I should see "This site has 2 subsection descriptions that are no longer visible to users."
+    When I click on "Migrate descriptions" "link" in the "region-main" "region"
+    And I should see "This will migrate 2 subsection descriptions to Text and Media areas." in the "Migrate all subsection descriptions?" "dialogue"
+    And I click on "Migrate all descriptions" "button" in the "Migrate all subsection descriptions?" "dialogue"
+    Then I should see "The migration task for all subsection descriptions has been created." in the "region-main" "region"
+    And I should see "Subsection descriptions waiting to be migrated: 2" in the "region-main" "region"
+    And I reload the page
+    And I should see "The migration task for all subsection descriptions has been created." in the "region-main" "region"
+    And I should see "Subsection descriptions waiting to be migrated: 2" in the "region-main" "region"
+    And I run all adhoc tasks
+    And I reload the page
+    And I should not see "Subsection descriptions waiting to be migrated:" in the "region-main" "region"
+
+  @javascript
+  Scenario: Delete subsection descriptions
+    Given I navigate to "Plugins > Activity modules > Subsection" in site administration
+    And I should see "This site has 2 subsection descriptions that are no longer visible to users."
+    When I click on "Delete descriptions" "link" in the "region-main" "region"
+    And I should see "This will permanently delete 2 subsection descriptions from the database." in the "Delete all subsection descriptions?" "dialogue"
+    And I click on "Delete all descriptions" "button" in the "Delete all subsection descriptions?" "dialogue"
+    Then I should see "2 subsection descriptions deleted." in the "region-main" "region"
+    And I reload the page
+    And I should not see "Subsection pages and descriptions are no longer supported in Moodle 5.2"
diff --git a/public/mod/subsection/tests/fixtures/subsections_with_descriptions.mbz b/public/mod/subsection/tests/fixtures/subsections_with_descriptions.mbz
new file mode 100644
index 00000000000..2550090994f
Binary files /dev/null and b/public/mod/subsection/tests/fixtures/subsections_with_descriptions.mbz differ