Rust marks can appear on a patio for various reasons, and can prove tricky to remove.
Rust marks can stain a patio where metal furniture has beenplaced onto a stone patio.
If you employ a lawn maintenance company they may spread fertiliser around your patio and path area. These products can contain iron, and when mixed with water and air they become iron oxide. Again, this will create rust marks on top of the stone surfaces such as patios and pathways.
Rob Parkers Best Rust Remover is easy to apply. Use a paint brush to apply the product to the affected spots and watch the rust disappear. Rinse the area with water once the rust has disappeared. When the area is dry Stoneworld recommend sealing the stone to prevent rust stains from occurring again.