I purge allot including "regapps", this is within a lisp routine I run all the time.
Code:.... (setq ce (getvar "cmdecho")) (setvar "cmdecho" 0) (command "purge" "a" "" "n") (command "purge" "regapps" "" "n") (command "purge" "a" "" "n") (setvar "cmdecho" ce) ....... (princ) )