Not sure if this will help ya or not. We use dry ice for cleaning machines at my work. We rent the machine and the dry comes in huge tubs ( 1.5 tons each ). Makes the after clean up nice also cause it just melts away.

The people who say I can't do it can just sit the @^#% down and watch me. Friends call me Rusto I also subscribe to pond boss mag. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=504716#Post504716