Started using the BARC rust remover from Front9 restoration a couple months ago and have been having great success with it. I bought a case and got a listing on their website the Professional Applicator for the Houston Texas area. The BARC rust remover is great because it removes Battery Acid Stains, Irrigation Rust Stains and best of all FERTILIZER rust stains. Been getting a lot of calls off the Front9 web site from home owners that fertilized there own lawn but didn't blow off the granules and now they have rust stains all over the driveway, patios, etc. Here are a few pics.