Prespray with either.. Prochem Power burst, Chemspec Enzall, Hydramaster Soilbreak or Hydramaster Bliz. These are all good products, others which are good possibilities which I have never tried are Vortex by restoremate and TMF Biopro 10k. Rinse out with an acid rinse like Clearwater rinse to neutralize. Don't worry about cleaning again with Prespray gold.