Saturate the rust stain with lemon juice. If the rust stain is small, use the juice from fresh lemons. For larger rust stains, bottled lemon juice will suffice.
Scrub the stained cement with a stiff wire brush. Do this for two to three minutes to make sure the lemon juice has been absorbed into the rust stain.
Allow the lemon juice to sit on the rust stain for a few hours. The sun will work to naturally bleach out the rust stain.
Rinse the area with water from the garden hose.
Fill a bucket with one-half gallon hot water. Add one-half cup trisodium phosphate, which is a cleaning agent and stain remover. Wait a few minutes for the TSP powder to completely dissolve into the water.
Pour the mixture directly onto the rust stain. Allow it to sit on the stain for 20 minutes.
Scrub the area with a stiff wire brush until the rust is gone. Rinse the area withwater from the garden hose.
Repeat this process, if necessary. It may require more than one application to completely remove the rust stain.
Things You Will Need
- Lemon juice
- Stiff wire brush
- Garden hose
- Bucket ½ gallon hot water
- ½ cup trisodium phosphate
- Muriatic acid also can be used to remove rust stains from cement. Follow the links in the Resource section for instructions on using muriatic acid. Be advised--muriatic acid will remove the rust but will also remove layers of the cement. Use muriatic acid only as a last resort.