We used Acid, Sno bowl, Rust off?? (from lowes) and some CLR the heat was at 265 and we were laying on it. Come to find out the maint. man had tried to clean it a year or two ago and he told he put acid all over it.. I'm thinking it was damaged like that. And he said he used and electric pressure washer. We use Industrial powered machines and it really bothers me it looks like that. Just wanted some comments on it to see what the crowd thought.
Thanks guys.