Removing Rust Stains From Concrete Floor ?

Muriatic acid. Works well, is reasonably easy to handle and works great. It's also used for cleaning in-ground pools. It's cheap at pool places, not sure about others.

Good luck, - Jeff G

Bob wrote:

TSP - trisodiun phosphate available at the hardware store is very good. Also good for washing down the greasy kitchen walls before painting. READ the label carefully. This stuff is caustic. No smell either.

Pete

TSP is good stuff & pretty cheap too. I use it for sterilizing during beer making. It's a great cleaner & sterilizer - didn't know it works on concrete.

- Jeff G

pete selby wrote:

CLR stain remover - Get it at any halfway decent supermarket or hardware store. Supposedly, it's specifically made for removing (C)alcium, (L)ime, and (R)ust stains/buildup. I'd tend to believe that, since it's so effective. Pour it onto the spot, and it'll literally make rust stains fade away to nothing as you watch. It has barely enough smell to bother mentioning (faintly lemon/citrus-smelling), and that small amount "fades into the background" in just a few seconds. It isn't at all greasy, and rinses away clean.

Last time I used it was for a shower stall in a long-vacant house in florida. When I moved in, the (originally white fiberglass) walls of the stall (and pretty much everything else in the house that had anything to do with being exposed to tapwater) were pumpkin orange anyplace the spray-pattern from the showerhead had hit them. You could use the CLR like ink to write on the walls - dip your finger, write your name, watch it magically appear in white over the course of about 15 seconds. (Rinse your finger afterwards, just to be safe)

Pouring the CLR into a squirt bottle and just lightly misting the walls with it had the shower back to white again within a few (probably less than five, total) minutes. Another 20 minutes or so of wandering around the house spritzing anything that showed a trace of orange had the plumbing looking spiffy again in short order.