I'm into my 3rd month with my truck mount and have managed to pay for it each month (and get it to fit in the garage). Most of my work seems to be abused carpet. I work for a lot of landlords so most of the work is rental properties. I have a 370SS. When I started I was using Grand Slam as a pre-spray and then Chemspec Dynaforce with Biosolve in the Solution line. I wasn't totally happy with the results in the traffic lanes so I tried Matrix Finish First with a Chemspec Booster in the solution line. While it worked pretty good I felt the residue might have been a bit much. My Jon-Don guy suggest that I try Grand Slam with Citrus force and get rid of detergent in the solution line and switch to All Fiber rinse in my solution line. So right out of the gate, I have a 15 year old white carpet. The results were pretty good but I am thinking a more aggressive chemistry would have done better. If I want to keep the all fiber rinse in the solution, how do I introduce a detergent into the pre-spray or will I have to do it in the solution line and then go back and spray with all fiber rinse and then do a fresh water rinse? That seems like it would double the time on job.