- 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.