 grilling out and you get some, you know, oil and grease from the hamburgers that you're making or whatever and drips on the composite or pressure treated wood, this ACT cleaner sprinkled on there, if you try the Dawn liquid soap and all those products, which will sometimes work, that ACT cleaner will dissolve that also or eat that is the way they claim it to do. It's a microbe that eats oils and grease.