README.md and project page have following content:
# Module Cleanup
## Introduction
Lists uninstalled or deleted modules with leftover transient data and allows the admin to delete any leftover data. A fix for [Module 'module_name' has an entry in the system.schema key/value storage](https://www.drupal.org/node/3137656) and [The 'module_name' entity type does not exist](https://www.drupal.org/project/paragraphs/issues/3165612) error.
## Installation
[Installation](https://www.youtube.com/watch?v=ZZdaJ9Shje4)
## Maintainers
### Current maintainers
- [Trigve Hagen](https://www.drupal.org/u/trigve-hagen)
We as module contributors and maintainers should be always aware of that an average user does not automatically know from where you, your concept and your solution comes from. And even if you think it is self-explanatory, for others it is not. So: Nor under configuration or any other sense-making admin path the mentioned list can be found. And there is no Drush command showing the list. The project documentation does not clarify "if, when and where" such leftovers get listed.
Active
1.0
Documentation
Apart from that: a very useful and appreciated contribution. +1! Even if it actually a little bit sad, that it is required under circumstances and we as community did not yet got rid of this issues.
Consideration: maybe you should ask Devel maintainers if they have interest to merge it and to give you credit for your work. This would actually be the best place for this function.