GroutMaster What is Groutmaster? it is the premier tile & grout cleaner that rarely needs prescrubbing. Mix 2-3 scoops, 4-6 oz in a gallon hot water. Spray it down, wait 5-10 mins and run your spinner over it. Cuts greasy filthy grout like nothing else and doesn't harm stainless steel appliances, transitions and cabinets. (Still wipe down any overspray of course)
And it's an incredible carpet cleaning booster. Just add 1-2 scoops to your current prespray inline sprayer mix and watch it work magic on nasties. Hope this helps.