I havne't had any luck using Frontline or Frontline Plus for earmites, even tho I know other people who have.
Earmites are very contagious cat to cat and can lead to infected ears and in some cases hematomas. I fight a constant battle agaisnt them at the shelter!
There are some over the counter treatments at most pet stores, these have to be used weekly but my cats tolerate them well. Some head shaking, but that is about it.
I use it as a preventative since I bring fosters into the house who often carry some mites.
Ivermectin is my miticide of choice. I get it from my vet, altho you can also order it from Revivalanimal.com and then dilute it yourself.
You drip it in the ears & it kills everything in there. Repeat in 7 days, which is the length of time it takes for eggs to hatch, I think.
I get almost everything from Revival
good luck with the mites! I hate them more than ringworm.
I think the mites in that man's ears died because they were on the wrong host. A lot of these parasites are host specific.