Sounds like you are doing all you can and run a sanitary daycare. One thing I have done is eliminate wash cloths and towels. I have a papertowel dispenser in the bathrooms and kitchen. I purchase the towels that have the half portions. It is cleaner and there is no revisiting what was left on the wash cloths. I am doing less laundry which I hope offsets the extra paper consumption. We are having a lull in the cold/flu department which we are enjoying, however I have heard about alot of people rebounding because the antibiotics aren't effective. Keep scrubbing, spring is on the way.