I know this isn't the point of the thread, but last weekend I was using some "bug and tar remover" on the wheel well and thought I'd give it a shot around the exhaust. With just a little applied all the soot buildup was gone. Alpine White spotless around the black exhaust tips (factory M Perf Pkg). For about a minute, then I drove and it comes back.
Anyway, not a bad solution. Easier than a clay bar as was suggested.
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