Not daily brushing, but periodic, when I start seeing blues. Mostly they just have geo. The humidity was running up to 98% before I got 2 canisters with silica that I weekly dry in the microwave. Some very interesting things were growing on the rinds then. It was rather yeasty smelling/stinky in there. I used salt and vinegar brushed on then. At present things are pretty stable and I am just using a dry brush. The humidity runs between 85% and 95%. I think the reason the gauge shows 80% is because the door had been being open. The best part is no more cracking rinds!