Whatever the method you use just don't change the humidity extremely.
The bigger the seedling the harder it is to handle extreme changes in humidity
Seeds I don't dome Clones I slowly expose to lower humidity
@Trala does pretty sure it says wash it off after couple hours
Think I got some concentrated, didn't care for it cause it went clumpy when mixed
I just use 10% iso to water with a couple drops of soap
Don't feel bad, I found my mod box in the street. Looked like it got run over by a car. Took me over a year to figure out what it was. Still don't know how to work all the modes it has. Got to say it's one tough unit