Remove rust in driveway?

[karlsch]

To prepare for painting or sealing or to clean or to remove stains, the standard method that has been used on concrete forever is to use a diluted solution of hydrochloric (muriatic) acid. It eats away a tiny portion of the surface of the concrete, thereby removing anything that was adhering to it. If you use it on a small portion of the driveway, you might have a spot stands out because it is "too clean." To avoid this, you might have to treat the entire driveway.

CLR is also an acid, but much milder than HCl, which itself isn't that strong compared to many other acids.

[LKJ1988]

Most of the stain is gone jane.

[Karen59]

Originally Posted by M3 Mitch

I think mixing these 2 chemicals will, or at least can, result in chlorine gas being evolved. Caution is advised, at least.

Originally Posted by Karen59

Muriatic acid is hydrochloric acid.

Muriatic acid plus bleach would be just like Power from Lysol! Power is HCl plus hypochlorite (bleach)

Please be very very careful, especially if you are mixing it yourself.

(Sorry, I like chemistry)

" Could you try Power toilet cleaner which is hydrochloric acid and sodium hypochlorite? It removes rust stains in toilets, I assume by a chemical reaction that might produce iron chloride or iron hypochlorite, which might be water soluble."


Sorry to resurrect an old thread, but I happened to look on the container of Power by Lysol in my bathroom, and it does not contain hypochlorite (bleach). The site I looked at wasn't the official site. In fact, it instructs users to not mix it with bleach, so Mitch is correct.

https://www.cvs.com/shop/lysol-power...prodid-1010662

It contains hydrochloric acid.