Re: Grey sticky stuff on the side walls.
Here is the response direct from Coker tires.
Gerry, that is mold release, an agent in the tire to protect the rubber.
When the tires sit over time that comes out of the rubber and hardens. Soap
and water should take it off, but you can use a cleaner like Simple Green
that will be a little tougher. I would stay away from anything with harsh
chemicals, and recommend regular cleaning of the tires if they are sitting,
just to be sure this does not accumulate. Sorry for the extra work, but
that should do the trick. If you have any other questions, please let me
Coker Tire Support
1967 the first Camaro
preceding all others as in time, order,or importance
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