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Old 12-12-2014, 12:25 PM
Doug D. Doug D. is offline
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Join Date: Mar 2012
Posts: 5,876
Default Re: Help! Staining on Gris?

Crud that has been reduced over time to just carbon is not going to be budged by lye. Electro would be the next thing to try to get it to release. If it is down to just black stains, straight vinegar and steel wool can often remove or at least minimize them. If it is stains remaining from removed rust, a product called Evapo-Rust is said to work amazingly well.

I'd say it's a C, but the dashes are unusual.
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