Rid-O-Rust Outdoor Rust Stain Remover, Concentrated Powder Formula, Removes Rust Stains, Calcium, and Limescale, 12 Ounces

Took the rust stains out of the driveway.

This product easily removed the red clay stains from my sidewalk.

It arrived as one solid chunk. The picture is after I took a screwdriver to try to break it up. Under the pieces you see continues as a solid chunk to chop up another day. The product does work fairly well once you get a chunk out and soak it in water and put it on the rust spot. It took most of the rust spots out of my driveway and worked pretty well on the rust caused by well water.

This doesn’t remove rust from concrete.

I have a new house and after 2 months the irrigation water started causing rust stains. This product made them melt away with no scrubbing. Granted, the stains weren’t aged.

After reading the positive reviews for this item, I went with it versus other options. It works pretty well. I used it on concrete rust stains. The strange part about it is that the results aren't very noticeable until it is dry. When I used it on the first spots, I wasn't seeing any difference, so I used a brush to help, which I found out later is pointless as it works by a chemical reaction and not by a cleansing action. I proceeded to use it on the targeted areas around my property and at first was fairly disappointed as I couldn't really tell any difference. However, as the areas dried, the rust stains were definitely less noticeable.

In the past I had tried various products and methods to try to remove rust. I used this as directed and was more than happy. I literally mixed as directed, sprayed in on the driveway, then immediately hosed it off thoroughly and rust was gone from the concrete portion of the driveway. If in the future I have rust to remove, this is what I will use. Very, very pleased with the results! Too bad I wasn't smart enough to take before and after pictures.

This product is amazing. Works quickly and is incredibly simple to use with minimal effort. Basically you mix the entire container with one gallon warm water. I then applied it to my concrete driveway with a deck scrub brush, but I suppose a mop could work as well. Only problem? I ran out! One container managed to clean about a 1/3 of my two car driveway. I also sprayed this product to wood fencing with excellent results, no scrubbing required.