I still use the old standby Tek-trol in the incubators and hatchers. I use the liquid that you mix up but there is an aerosol available that some people prefer because it doesn't smell quite as bad. I have also used Oxine in the past as well and had good results with that. I use Tek-trol on the waterfowl eggs religiously ( I am much more lax and the chicken and turkey eggs). After I bring the waterfowl eggs in they are washed and I have a large sprayer of Tek-trol handle to spritz the eggs in the trays. I also have a small travel size spritzer fill with Tek-trol in the incubators so that every time I handle the waterfowl eggs between candlings they are spritzed with a mild Tek-trol solution. After each hatch I clean out the inside of the hatcher and then spritz it with Tek-trol to be waiting for the next hatch.
Hope it helps,