Smartseal Rust Remover - Acid-Free Rust Stain Cleaner for Natural Stone, Concrete, Driveways & Patios - Safe & Easy to Use - No Damage to Surfaces - 1 Litre

Excellent, worked well on my natural stone patio. The stain marks left after washing away disappeared when the stone dried and left no marks. Just be prepared for the rotten egg smell, is quite strong, but I wouldn’t hold that against the product.

It Works Not the best on porcelin it stains

What people should know - FOLLOW THE INSTRUCTIONS ON THE LABELI read a few reviews that said it did not work or left stains - so was a bit cautiousHOWEVER - It was brilliant - worked first time - I have Indian sandstone patio slabs and has two big circular rust marks from an iron patio umbrella stand, looked horrid - followed the instruction - dry slab, put on fluid, work with brush, leave max 10 mins, flush with clean water = worksWould say push the extra fluid that is past where the mark is back over the stained area and work in with the brush, and keep doing that for a few minsUsed a lot of water to flush it - there seemed to be a mark or darkened area left but this totally disappeared after a while, assume it was the fluid penetrating deeper into the stone than the water.Only down side is when it works it smells like rotten eggsWish I had videoed it for you to see but was too excited that it actually worked.

Had removed old garden furniture which left rust marks, didn’t know if this would work but thought I would give it a go, it is easy to use with a brush and goes a long way also.Turns purple on contact with the rust and the rinse off. Stain is removed, great product

Tried this on rust stains on a concrete patio. It lightened some of the marks but didn’t fully remove them, even after two applications. Easy to apply and no damage to the surface, but performance was average. Might be better for lighter stains.