That's what I found too, but some websites had detailed instructions describing how to remove the mites?
Hissing cockroaches don't quite get "stressed" the way other pets can. They'll hiss when disturbed, but this isn't directly detrimental to their health the way tarantulas react to, stress (for example). If a hissing cockroach gets extremely stressed it will vomit, but I've only had this happen twice in my 6 years owning hissers, and this was after about an hour of constant handling. I say this all to say that handling your roach to remove mites shouldn't hurt it, if you are concerned. Some people I've read about occasionally bathe their roaches with a toothbrush and some warm (DECHLORINATED) water. That's something relatively non-invasive that you could try.