I'm not sure what type of rack set-up you have, but once you remove the snakes and tubs, couldn't you move the empty rack out of the room and spray it first, then it can dry while you do the tubs? Also, for the racks, you don't really need to completely spray them down. You can spray the Provent-a-Mite on a paper towel and wipe down about a 1"-2" barrier along all the edges. It's up to you...
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