My brother's garden was always badly stained from his dog's urine. This discoloration was the result of his dog's urine pooling, then mixing with the dust our gardener brought in and boiling at over 100 SoCals. The brushes I've used in the past have been successful in removing the top layer of this urine sediment, but have never been able to penetrate the deeper layer of discoloration. No matter how hard I scrubbed or what chemicals I used, there was always some dark stuff left in the cement. This brush got rid of those stains with minimal scrubbing. I think this brush would probably peel the skin off if you used it on someone (please don't try that!). Anyway, I give this brush 5 stars because it helped me remove urine stains from 5 year old cement dogs. Highly recommended for a similar task.
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