Treat with muriatic acid if all else fails.
Muriatic acid concrete stain removal.
Mix a solution of 1 part muriatic acid to 8 parts water in a bucket.
If you need a stronger solution mix 1 part acid to 10 parts water.
The easiest dilution to remember is 1 cup of acid to 1 gallon of water.
Usually a solution of 4 parts water and 1 part muriatic acid is enough for a heavy duty cleaning unless specified otherwise.
Procedures used for the oxalic acid and tsp are also applicable here.
How to remove muriatic acid stains from concrete step 1.
How to remove paint from concrete with muriatic acid step 1.
Allow the solution to sit for a few moments.
Play pause space step 2.
Choose a stripper that is recommended for concrete.
You can buy muriatic acid from your supermarket but you should handle it with extreme caution.
Vacuum the concrete to remove all particles and debris.
Step 4 try muriatic acid.
Pour the acid into the water to avoid.
Scrub the surface with a hard bristled broom or.
You know the muriatic acid is working if you can see it bubble as it reacts with the cement.
Pour the solution over the painted or stained concrete surface.
Attach a scrub pad to a floor buffer.
Pour chemical floor stripper on the concrete.