Pro Shot in the field, Wipe Out in the evening. blue patch says you got the copper.

I follow with GM top engine Cleaner for the carbon, 2- 3 soak and brush applications and the patches come out black.

If you can find the GM stuff you are lucky. they dropped it when throttle bodies came out, but Vette guys and bench shooters love it.

your local parts guy can look in his computer for some.

HM