#1 rule ---- NEVER scuff anything before it's been cleaned and decreased. The reason for that is because if you scuff first - you push the grease and dirt and wax etc into the scuff groves (for lack of a better description).
Simple Green is good for a first couple rounds of cleaning....
Then I use PPG DX 330 - which is a wax and degreaser... When it's SQUEAKY clean (yeah you can actually get it to squeak)... then you scuff.
Make sure you test a spot with your paint of choice -- you'd be surprised at some of the bad reactions you can get. No point in finding that out after you've shot the whole area.
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