Answer
Feb 14, 2022 - 01:46 PM
The following recommendation is based on the assumption that the rust stains were created from a metal/iron surface and as the surface rusted it stained the Pennsylvania Blue Stone and grout. Typical color of the stain should be orange to deep brown. If the assumption is correct the SealGreen Rust Remover will remove the rust stains.
Sample of a rust stain from metal or iron:
Source: SealGreen Website
