The Data Cleaning app is available only in the Odoo Enterprise edition, which is why you don't see it in your Odoo.sh app list.

  Ensure your Odoo.sh instance is running the Enterprise edition.

  If not, consider upgrading to the Enterprise edition to access the Data Cleaning app.

  Contact Odoo support for assistance with upgrading your plan if needed.

If you’d like to explore this further for your use case, you’re welcome to connect with us at Pragmatic Techsoft.

If you don’t see the Data Cleaning app in your Odoo.sh app list, here are some steps to help you get it installed:

1. Check Odoo Version Compatibility:
   Make sure the Data Cleaning module is compatible with your Odoo version. Some apps are only available for certain versions.
2. Enable Developer Mode:
   Go to Settings > Activate the Developer Mode (also called Debug Mode). Sometimes more apps or modules become visible in developer mode.
3. Check Apps Filters:
   In the Apps menu, clear the default filters like “Apps” or “Installed” to see all available modules.
4. Install from Odoo App Store:
   If it’s not visible in your instance, you can download the module from the Odoo Apps Store if it’s available there, then upload it to your Odoo.sh repository and deploy.
5. Custom or Enterprise Module:
   The Data Cleaning module is often part of the Enterprise edition or available as an extra app. Make sure your Odoo.sh plan includes Enterprise apps or check if it needs to be added via a custom module.
6. Add the Module to Your Odoo.sh Repository:
   • Clone your Odoo.sh GitHub repo locally.
   • Add the Data Cleaning module folder into your addons directory (you can get it from Odoo’s official repo or app store).
   • Commit and push the changes to your repo.
   • Odoo.sh will automatically update and you can then install it from the apps list.

source:-  Chatgpt