Tony, rent a bush hammer and try a sample area where the staining is at it worse. You can go to any depth to see where the staining/saturation ends. As mentioned before, the concrete is porous and most likely soaked in pretty good. If this bush hammering becomes an option, you can rent a scabbler (does a larger area at a time) and do the entire floor and then skim coat it with an epoxy. Good luck.
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Darcy
2019 ZL1 A10 Camaro Convertible
Davenport Stage 2 tuned.
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