If acid does not work then the only other means you have available are chemical top coats.
Muriatic acid to lighten concrete stain.
Keep in mind that acid stains are not soluble in water.
How to neutralize concrete acid stain.
A solution of 40 parts water to 1 part muriatic acid a scrub brush and cotton rags will help remove the stain.
You can use a mild acid to remove some of the color.
This acid reacts with the concrete opens up its surface and penetrates the concrete with its own metallic salts staining the concrete the chosen color.
It also reduces the surface alkalinity of the concrete that can cause some paints to adhere poorly.
A smooth concrete floor must be roughened before paint will stick to it.
The surface becomes etched and clean which allows for the proper adhesion of a new coating.
Muriatic acid can work wonders on filthy concrete and it can also be very useful in cleaning excess smears of dried mortar and grout or when attempting to alleviate tough rust stains.
Concrete stain is the next logical option as you can stain the surface of the concrete.
Always add the acid to the water to help prevent acid splashing out of the mixing container.
Today concrete can be both stained and dyed to achieve a variety of colors and textures.
How to choose concrete acid stain colors.
This means that water alone will not do much in regard to removing the orange colored stain.
How to neutralize and rinse concrete acid stain.
Concrete stain is based on muriatic acid.
You should see a chemical reaction as soon as you apply the muriatic acid.
Pour the acid into the water slowly.
After the concrete properly dries it s time to unveil the artwork and see what color the concrete has really become.
You roughen such a floor by etching it with muriatic acid.
Apply the solution to the surface.
Muriatic acid acts like liquid sandpaper by roughening the surface of the concrete.
Use a garden sprayer or paint brush to apply the solution to the stain.
The acid works well on concrete and on many masonry projects because it neutralizes alkalinity.
So if you want to scrub it down to try and lighten some areas do it when you first wash the residue.
Despite its effectiveness muriatic acid should be used on concrete stains only if you ve tried gentler alternatives to no avail.
