Rust Master removes rust stains from surfaces.
Attacks rust stains like no other product–quickly and effortlessly.
Rust Master can be used to remove rust on carpeting, upholstery,
laundry, tile, or concrete floors. Chemical reaction breaks down rust,
releasing it from surface for easy removal. Contains Ammonium

Ready to use pH is 3.5

RustMaster Liquid is ready to use—DO NOT DILUTE.
After stain removal, neutralize the area with diluted alkaline detergent and rinse.