Andreas,

about 3 years ago we announced a convention for cleaning up that put  
an end to this kind of script.

Classes implementing #freeSomeSpace would clean up caches, and  
#cleanUp prepared for a release. I added SmalltalkImage-c- 
#cleanUpExcept: which was also useful for making a release when for  
example you didn't want to wipe out the ChangeSets.

Keith