Hey there Bernie, I know some detailers who use a mix of 1/3 new engine
oil and 2/3 metholated spirits, squirt it on and rub it in.
I havent tried it so maybe a good idea to try on some old tyres first.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.