Deleteable files

By cleanup do you mean check in (i.e. the minimal set of files you need). Just remember if you start deleting db folder files and have incremental compilation turned on you'll have to do a full compilation next time.

Typically when I go to store off a minimal set I keep these around:

ptf

qsf

qpf

bdf (top level)

component folders

software folders (without /debug or /release)

sof (so that if I come back I don't have to regenerated and compile again)