It shouldn't amaze me any more - but still does - the number of people who just have a go whatever.
the guy didn't notice mites at a show, ffs. And wants now to treat them. He hasn't abused or neglected his animals, or children, or spread ebola
op - its considered wise to quarantine new animals anyway, so keep them away from your royals and keep equipment separated hands washed etc
I myself did use callingtons on baby hoglets (bought with mites from a VERY well known dealer btw) with no ill effects, but nearly had a heart attack when I read that callingtons can have side effects with hognoses.
So best to probably avoid, but I don't know what else to use. Hopefully the other advice is more useful