Worked pretty good but took a few applications for some recent but really bad rust stains on my concrete driveway. Some older rust stains didn't come out but I think they will if I keep applying. It took the rust from my A/C drain spout on the side of my house (stucco) off instantly. All in all pretty please with this product.

A stucco wall had a long rust stain (about 6 feet long x 4 inches wide) due to a bad rain gutter. That gutter was replaced 13 years ago and the stain has bothered me ever since. Today I applied the rust remover with my pressure sprayer. Within a minute the stains were gone!

I also had some very old rust stains on a concrete walkway that were caused by iron supplement lawn fertilizer. Again, the stains were gone in about a minute.

If you have some rust stains to remove then this stuff is the miracle you've been waiting for. Just spray it on and watch the rust disappear.

I am now a TRUE BELIEVER in this product. A co-worker of mine raved about how this just has to be sprayed on and walk away. Well, that's exactly what I did with a huge sprinkler well water stain on the side of my house. Before I was even done spraying the stain, it started disappearing. I'll let my photos do the rest of the talking. Forget CLR... Get this one.

Costs more than gold but it works. Removes rust stains from my well.
Everyone saying this doesn't work is lying or they aren't rust stains. Don't make me prove you wrong by posting pictures next time.

I wanted to evaluate on this.

There are different types of stains. The stains that come from irrigation wells are generally rust stains. They take a few weeks to start forming after the sprinklers have coated the areas multiple times.

One application of this stuff generally removes ALL my rust stains with no problems at all. Pressure washing won't do it. SOMETIMES I have to rinse and apply again, but usually not. The 4 star rating is because you KNOW this stuff can't cost more than a dollar to make and a dollar for the container, but because it genuinely works it costs $10 a gallon which is just pure insanity.

After all these years of being careful NOT to get rust stains on the stucco, a leaking outdoor faucet caused a huge stain. I bought this KNOWING it would be a gimmick, but it worked on PINK stucco in South Florida. I did have to do it more than once to get it completely off, but it's like it never happened. I am amazed.