I do it after every hand wash, and not only does it help with drying, the slickness it leaves is mighty impressive too. I don't care what brand you use either. I've used Eagle One, Turtle, Meg's, Mothers, and another one that slips my mind right now. They all do the trick, even the cheapo Turtle, which smells pretty good too. Worth spending $3-5 to add it to the wash process IMHO.