Today i am cleaning carpets in the office of a car dealer service shop. Its blue cgd, and in the main pathways, i have cleaned 1 hallway literally 6 times with bio break and groutmaster at 600 psi high heat. My sight tube STILL shows dark brown water. And the carpet STILL has an obvious brown pathway. I obviously cant spend a 2 weeks cleaning 2,500 sq ft of carpet. What do you do in this situation? Im just going to clean like regular since it seems to make no difference whether i sit and scrub vs just doing a good strong once over.