28. Clean Rust Stains from Concrete
We're talking walkways and walls here, not polished floors and countertops, which have a hardened surface that resists staining. (Should you one day discover a rust stain behind the toaster oven, hit it with Soft Scrub and an abrasive pad.) The only way to remove rust stains that have worked their way into a slab is to (a) etch the area with muriatic acid, or (b) cut it out with a grinder, says Bob Merkt, of Kettle Moraine Professional Cleaners, in West Bend, Wisconsin. Then you have to patch in new concrete and wait for it to blend in over time.