I have had dermestid for about 2 yrs now and have a reoccurring problem. After i take skulls out of the bugs i shake and blow off with an air compressor and seem to get alot off. But when i rinse the skull before de greasing i seem to kill about 150-300 bugs every time and hate doing that. I have around 50-60,000 but thats a lot every time i take out a head. It does seem to help when i put a fresh one in and they migrate off the old one but not all the time do i have another one to put right in there. Any suggestions appreciated, thank you.