CleanOsu is a program most likely written by dukambe that replaces song backgrounds and deletes commonly unused map-specific skin elements. Due to an update to the osu! stable client, the original version of this program broke.
I decompiled the original exe with dnSpyEx and fixed a few things:
- Fix broken registry path
- Migrated from an old version of .NET framework to .NET 8.0
- Changed some code/added a package to make user.config work properly
- Changed obsolete form of
MD5.Create() - Add more elements to delete instead of replace image for (sliderendcircle, sliderstartcircle)
TcNo-osu!cleaner is probably superior to CleanOsu, but I haven't tried it.