Cayugad put me on to this homemade solution and I like it. It doesn't freeze in cold weather (I've hunted down to 9 degrees F with it), cleans well, evaporates fast, leaves no residue, and the price is terrific!

When I do a thorough cleaning I use this solution and follow with dry patches until completely dry. I then swab with a couple of patches with Birchwood Casey Borescrubber which will remove remove all types of fouling (plastic, copper, lead, nitro), dry patch until they come out clean, then finish with Birchwood Casey Sheath for storage.