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Try 4:1 first.. its tough to say how stubborn and old the paint transfer is by looking at the pic.. if that does not work, you can try FS. I used megs, but any APC should work fine.FS APC? and what apcs are you guys using? megs? zep?
I would try a matte/satin only product. APC, and other chemicals, can actual stain matte/satin paint and cause a shiny area to appear. CG makes a matte detailer as does Swissvax. I would start there.
its a spoiler currently off the vehicle