Masonry Cleaner, 1 gal.

With patience this product works well. I was removing some glass bricks. Once I was able to apply (with a brush) this product along a wide area, I waited and chipped away with a hammer and chisel. I then re-applied, waited and proceeded. So I had to get the brick out before I could apply to an area wide enough to be practically effective. Once I did I was in business.

May take more than one application to remove stain

Works perfectly. Very little odor

This is a concentrate, works good without the dangerous vapors. If you have heavy cleaning to do this may not be the product for you

very dangerous liquid

Very good and versatile product

It certainly works for what it claims to do.