are you trying to clean plastic tubing? don't let it soak too long -- i've read iso removes the plasticizer component of the plastic and makes the tubing stiff/brittle.
Make sure you read the ingredients. It should be only isopropyl alcohol and water. Some of the cheaper rubbing alcohol compounds use ethyl alcohol, bitrex, camphor, diethylphtalate and other things that probably don't evaporate cleanly.
A fan works but also blows a lot of dust into your honey.