Pour gallon of water in a pot.
Clean rust off cement driveway.
Mix 1 2 cup of trisodium phosphate into 1 2 gallon of hot water until the trisodium phosphate has dissolved.
By the way my rust stain issues are now over because i added a water softener which removes the iron from the well water.
How to remove rust from cement method 1 of 3.
Remove the surface dirt and debris from your driveway by sweeping the area with a stiff.
Rinse the area off with cold water.
Allow the driveway cleaning solution to remain on for a few minutes.
Place the pot on the stove and bring the water to a boil.
A fairly new rust stain may succumb to the mild acid of white vinegar.
Scrub as much as you can but if it s too deep there s not much you can do.
Move on to commercial cleaners if vinegar and lemon juice don t work.
Then carefully pour the mix onto the rust stain and gently scrub the surface of the concrete with a stiff bristle nylon brush.
For particularly stubborn stains rinse the acid away with a pressure washer.
Using the scrub brush scrub the stain using a considerable amount of pressure.
Pour enough of the solution onto the rust.
Trisodium phosphate is an irritant to your skin.
Pour the vinegar over the stain let sit for 10 minutes then scrub with a stiff nylon brush.
Rinse and wash the concrete with soap and water before beginning.
Be very careful as it tends to lighten the concrete leaving a rust free but noticeably lighter spot where you used it.
The grass did die a few inches away from the concrete but seems to be coming back two weeks later.
Wear goggles and rubber gloves to protect your eyes and your hands.
For cleaning concrete pour the lemon juice or vinegar directly onto the rust stain and allow it to sit for ten minutes so the ingredients can fully penetrate the rust.
In hindsight a longer soaking would be a good idea.
Finally you can purchase a rust remover product.
Use a brush that s appropriate for your concrete to avoid damaging it.
Follow the instructions on the package exactly.
Rinse and repeat if the concrete.
Fighting major rust stains.