I have a friend that always has his " woolies" dry cleaned before every hunting season. He then places them in a plastic bag with 1/4 box of Baking Soda and " dry rinses" them for a day. He then removes all the powder and air dries them outside for a couple days and permantely put them in a rubbermaid container with twigs/sticks/pinecones etc from the area he hunts. He has never had any concerns with scent left behind by dry cleaning and his record in the field shows it.