I tried it for the last cleanout of my hay crate and it's the best thing I've ever used! It took all pee stains off in no time with no effort!
I've tried everything, Fairy liquid, jif creme, cillit bang, vinegar... nothing takes out the stains like citric acid. Here it's sold in baggies and it's not expensive at all. I just rinsed off everything with hot water, sprinkled citric acid on the stains, left it on for a minute or so and then scrubbed everything off with one of those green kitchen sponges. No stains!
I've tried everything, Fairy liquid, jif creme, cillit bang, vinegar... nothing takes out the stains like citric acid. Here it's sold in baggies and it's not expensive at all. I just rinsed off everything with hot water, sprinkled citric acid on the stains, left it on for a minute or so and then scrubbed everything off with one of those green kitchen sponges. No stains!