RustAid GSX00101 Goof Off Rust Stain Remover, 1 Gallon

I put in a spray bottle and used on my vinyl fence that was stained from sprinklers! No scrubbing! I couldn’t believe just how well it works! Stains disappeared almost immediately as I was spraying it on! Also used it on a new stainless steel sink that was discolored and nothing I used would do anything to lighten stain! Again, sprayed on and stain immediately disappeared! Also used on toilets that had those ugly brown mineral stains that nothing would take off! Worked like a charm!

I had a rusty metal fence around part of my pool to keep my sable shepherd out, otherwise she’d spend all day in there. The concrete was badly stained with rust. I think the key to using this is to brush it on evenly with a broom. Using a sprayer was a waste of time. The results were fantastic. All the rust was removed and I followed up with a power sprayer to make sure I got all the residue flushed off. Highly recommend.

Good product that works well. However price for product went from $14.00 to$59.00.

Did not work for hard water stains in our bathroom

This works great removing rust/hard water stains off a white vinyl fence. Spray it on and come back 20 minutes later to hose off. Works great.

As EVERYONE else has said, it is REALLY nice to have a product that works EXACTLY as-described by the manufacturer.My property also has in-ground irrigation sprinklers that water the lawn / shrubs, but of course the water also touches other stuff.Because my water has iron it leaves rust stains.I fill the 32 oz ZEP professional pump spray bottle sold at the big box home improvement stores, then spray all the rust stains and the stains disappear. I carefully removed the label from an empty gallon bottle, folded it and taped it around the spray bottle. I use a small plastic funnel to transfer from the gallon bottle to the spray bottle.My long-term usage of this product revealed that eventually the pump sprayer stopped working. My resolution was to submerge the spray assembly in warm soapy water and actuate the lever until normal operation was restored.Depending upon the wind conditions there is a not nice smell that is probably not good. The manufacturer's SDS says: "When used as directed, respiratory equipment should not be needed." I'm not using breathing protection but I get away from the fumes as quickly as possible.When I first started using this on the deep / dark stains I attempted to attain better / lesser usage of the product by using a toothbrush to help the product work better. In my mind on those well-established stains the brushing helped me conserve product.Now it is just a quick spray to attain clean results.It is also used on my painted building walls, where hit by the sprinkler water. I also use it on my flagpole. Everything else, like the concrete curbing the driveway, retains the rust stains.

This successfully cleaned off years of rust from sprinkler water hitting house. Siding back to original color.

I used this to remove rust stains from a concrete porch. The rust stains originated from some old steel planters we had on our porch. The product did a decent job of lightening the appearance of the rust stains, but it didn't remove the stains entirely. This could be partly because the stains had been there for years (not fresh). On a scale of 1-10 with 10 being the worst stain, it did reduce the years old stains from level 10 to a level 3 or 4.