If you've discovered rust stains on your concrete patio from metal outdoor furniture, don't worry - these stubborn marks can be removed with some simple techniques. Rust stains occur when iron in metal furniture oxidizes and transfers to concrete surfaces, especially in damp conditions.
For light rust stains, create a paste using lemon juice and salt. Apply this mixture directly to the stain, let it sit for 30-60 minutes, then scrub with a stiff brush and rinse thoroughly. The citric acid in lemon juice breaks down rust while salt acts as a gentle abrasive.
For more stubborn rust, use white vinegar combined with baking soda. Spray or pour vinegar over the stain, then sprinkle baking soda on top. When the fizzing stops, scrub the area and rinse with water. This chemical reaction effectively lifts rust from concrete pores.
Commercial rust removers containing oxalic or phosphoric acid work well for severe cases. Always follow product instructions, wear protective gear, and test on a small area first. For persistent stains, consider using a poultice made from commercial rust remover and diatomaceous earth, which draws rust out of concrete through capillary action.
Prevent future rust stains by applying concrete sealant, using furniture with plastic feet, or placing protective mats under metal furniture. Regular cleaning and immediate attention to new stains will keep your patio looking pristine year-round.