Thanks for the reply a.k.a. Patrick.
I too wonder about using anything abrasive on the PPF, even though it does have a clearcoat layer. Right now there are no swirl marks under the film, but I'm sure eventually there will be marks on the film just from regular washings and use.
What to use then?
I have e-mailed 3M about this. I am hoping they will actually reply.
Duke