I recently picked up a new account of a trailer pk with a high turnover.lots of red stains,and ratt nasty big time.I must say that on top of using power burst as a pretreat works very well.today i used the free gallon of fission on a really rat nasty shit dump and i was very impressed with the release of the soil and grease WOW that stuff really cuts thru.then i used a 1 part PROCHEM red stain remover 16 small and lg red spots came right out even the bigger ones that went from red to dark yellow,I hit them one more time and they were gone.$$$$ i love it.keep in mind i was trained back in 1994 on vacant apts to remove red spots with ammonia which would discolor if used to much.these prods are the money makers