Rust stains on block paving can occur from water running over rusty metal fixtures/fittings or from accidently spilling weed/moss killer containing ferric sulphate and is probably the most difficult type of staining to remove from paving blocks.
Accordingly, how do you remove old rust stains?
To remove rust stains from clothes, mix a few drops of hydrogen peroxide together with a teaspoon of tartar cream and baking soda. Apply the resulting paste onto the stain, let it sit for 30 minutes, then rinse it thoroughly and wash the clothes as usual.
Likewise, people ask, how do you remove rust from porcelain paving slabs?
Completely cover the stain with NO RUST. Leave it for 15 minutes, then remove the residue and rinse thoroughly. Alternatively (and for very extended stains) use DETERDEK PRO. Wet the area with water, then use DETERDEK PRO and scrub the stain with a green abrasive pad.