Iron OUT Outdoor Rust Stain Remover, 1 Gallon

My irrigation system is on well water and as many of you know, stains everything except the landscaping ... This Iron Out is amazing!!! I used a gallon sprayer and sprayed my white river rocks, aluminum %26 vinyl siding, wood fencing, plastic planters as well as some concrete (but it was newer stain, I'm not sure how this would work on older/set-in stains, but worth a try). I did 2 rounds and then used what was left on some of my neighbor's landscaping rock that had been stained for years because their '$200 rust prevention tank system' hadn't worked for that time. Her yard might take 2-3 rounds, but it's worth it for sure. I will definitely be purchasing this product!