Sheesh. Wish you guys would ask questions before you did stuff.
First you need to pre-wet. Can clean with bleach with some sodium hydroxide. Need a strong alkaline mix, would have mixed something like EBC with it for surfactant.
Second rinse thoroughly with warm water between 150-180 deg. You want medium pressure , no more than 1000psi.
While it’s still wet need to apply neutralizer to keep the orange stains from coming out. Combination of acetic and citric acid. You could probably go 1/2 oxalic and 1/2 citric. Let dwell just a few min and rinse thoroughly again with medium pressure.
So, to try to fix, I’d re-wet completely and then try the acid mix.
Prosoco makes some good stuff for Limestone or as someone mentioned could use One Restore in the future. Could try some on the orange part, but would try the acid first.
