Hmm. I've got M205 for my fine polish. Still too harsh if I'm using a white pad?
I will be using my Nanoskin Fine Mitt for claying before every wax because I don't garage my car, and my parking lot is grass and sand. Plus with Illinois winters, I imagine there will be lots of contaminants. I'll definitely baggie test the car though.
How many spots do you need to test with a baggie to be confident that there's no contaminants? I clayed my car a little bit, and it barely pulled any contaminants (car is only 1 year old).