Thanks to all for the replies.

Lee, I've been using Hopps No. 9 almost exclusively to clean my ML. I did pick up a bottle of the Montana Extreme Cowboy Blend and have not noticed much difference. I'll try cutting it with alcohol to see if that helps.

ronlaughlin, the Windex multi-surface cleaner - is that the one with vinegar? That might explain the warning about letting it near your barrel.