The microbial grease cleaners are amazing, however there are more economical alternatives than Griots. You can find them for $20-40 per gallon and depending on brand and how tough your stains are they can be diluted from 5 to 20 times. Just keep them wet, how they get oxygen, dont freeze them and dont use if temp is over 120. If you do this, its amazing the stains they will remove from concrete. Love them bugs.

Bob H.