couple of things to try before you go crazy with elbow grease...
stoner's tarminator - i know you can pick this up OTC but i'm not sure where
any APC... some good ones i'll list
Majestic solutions super green stuff diluted 3:1 or 2:1 for very bad situations
meguiar's APC+ - this is from the professional line
these two are relatively cheap too!
be sure to let anything you try dwell for a while unless the product says otherwise
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