really they are sterilizers, to clean you'd need to also rinse something i think

mainly useful where you have constant high humidity that fosters growth of fungus that fill the air with allergenic shit

the magic trick of it is that it lets you make a surface close to boiling point briefly which kills fungus and also will kill insect eggs and small insects and stuff like mites... these also are reasons why it's useful

usually it's just a remedy for a badly ventilated building, on the whole, but where i live it would be a boon for keeping stuff from going moldy