I am about to reinstall a completely cleaned up intake manifold (1989 560 SEL). I noticed a lot of residue on the mating surfaces of the cylinder heads.

My plan for now to cleaning this up is using acetone as a solvent, but I am looking forward to any other suggestions. What have others done before bolting the manifold back in with the new gaskets?

__________________
Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)