Per SC:
"
I was told by our detailer that he uses Wurth Active Clean. You spray it on, let it sit a minute & then lightly scrub with a rag. If you are not able to get that, he said Oxy Clean should work as well.
He recommended that you just make sure you read the precautions and test a small before doing the entire thing.
Hope it works!"
that Wurth Active Clean shows as $30 a can on eBay?! Seriously?!