I tried to find out what could make CC better, so i took a look around on my harddisk to see if anything was taking up unnecessary space..
I found:
.gb1 - a backupfile for the games you make with GameMaker (it should be deleted when the game is finished)
.dmp & .txt - files in the *\World of Warcraft\Errors\ folder taking up space (might be needed if your WoW is crashing. not else)
.log or .txt - files in the *\UnrealTournament\Logs\ folder also taking up space
don't know if this is an idiotic post or what. but these things do take up unnecessary space
maybe everyone should look for crap-files and post them, so they could be added to the cleaner??