Do not use metal bristles as they can remove the top paste layer in the cement and expose the aggregate material beneath this layer.
Work in a well-ventilated area. Wear gloves and eye protection. Stick to long sleeved shirts and pants to protect your skin.
They often come in liquid or powder form. Spray or sprinkle the cleaner on the rusted surface. If the cleaner is made of powder, wet it with water. Allow the mixture to sit for several minutes before continuing. [4] X Research source
Put on gloves before handling TSP. Pour the mixture on the rusted surface. Allow the mixture to sit for 15 to 20 minutes.
Let the acid soak into the stain for 5-10 minutes. Scrub away the rust stain, working quickly. Rinse the surface thoroughly with water. Repeat as needed.
Choose a weekend with very little chance of rain to work. Wash the concrete and remove any existing stains. Starting in the corner, roll the sealant onto the concrete. Let the sealant sit for 48 hours before placing any furniture on it. [5] X Research source
You can get felt runners, or outdoor carpets and mats, to protect your concrete as well. You can try coating your metal furniture with a sealant to prevent rust. You can also seal already rusted furniture to prevent the rust from spreading to your concrete. Even interior concrete can get rust stains if the room is moist or humid, so be aware of any metal to concrete interactions.
