I m not sure power washing is important but i figured any surface dirt might insulate the rust deposits preventing them from being dissolved by the next step the acid.
Best way to clean rust stains from concrete.
Cut your hose on jet or a similar setting.
Using the scrub brush scrub the stain using a considerable amount of pressure.
Use your stiff brush to scrub the area with the rust stains and then rinse with the hose.
Spray them with oven cleaner.
Use a brush that s appropriate for your concrete to avoid damaging it.
If you have a grease or other stain you still can t remove from concrete or asphalt it s time for a different approach.
For particularly stubborn stains rinse the acid away with a pressure washer.
3 8 in a pump up sprayer i mixed a 50 50 solution of water and a product called acid magic.
Make sure the surface is clean apply the rust remover or acid following the instructions and safety precautions on the bottle let it sit for five to 10 minutes then scrub and rinse.
Spray the stains directly to see what you can get up.
Spray any stained areas with oven cleaner then let sit for 10 minutes.
Removing rust stains from concrete first things first use a pressure washing or a power washing technique to get rid of loose dirt on the cement.
Make sure to use in a well ventilated area as oven cleaner is some nasty stuff rinse off with a hose and the stains will disappear.
Once you ve done this use a dry cleaning method or let the cement air dry before moving on to the next step.
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.
Rinse the area off with cold water.
Pour the vinegar over the stain let sit for 10 minutes then scrub with a stiff nylon brush.
Let it settle for 5 10 minutes then scrub with a stiff.
A fairly new rust stain may succumb to the mild acid of white vinegar.
Rinse and repeat if the concrete.
There are a few rust removal methods that can get rid of those stains and restore the look of your concrete driveway.
Vinegar rust stain removal step 1 remove the surface dirt and debris from your driveway by sweeping the area with a stiff broom.