How to clear uninstalled apps of app world.
I was able to on OS 5 and OS 6.
1. on OS-5 = You used to be able to clear them with alt + RST. (hold down ALT and type the 3 letters R S T).
2. on OS-6 :
2a. Reinstall it.
2b. Pause it
2c. then cancel download and it will randomly be deleted.