Since Joan is having problems with her internet connection, I'll try to help you. Provent-a-mite alone isn't going to get rid of the mites. I suspect you're looking for an easy way that will be certain to get every mite. Unfortunately, there isn't such a method. Getting rid of mites takes hard work and diligence. If your collection is large, there is no denying it will be difficult.
I'll give you a summary of what you'll have to do and a link that gives you all the step-by-step details. The reptiles will have to be removed from their cage. You'll need to give them a bath in a Betadine solution (tea-colored, as stated above), then put them somewhere safe while you deal with the cage. Everything will have to be taken out of the cage. The link I'll give you tells you exactly how to get rid of mites on everything from the heating pad to the water bowl. You'll have to use some sort of toxic chemical (like bleach water) in the cage, unless you live somewhere that still has outside temperatures in the 80's or above, where you can use heat to kill the mites. If you have that option, the details are given on the link, which I'll give you again in a moment. After using bleach water or another chemical, the cages have to be thoroughly aired to make them safe for the reptiles once more. The room where your reptiles live will also need to be cleaned well because mites wander all over. Even if you get rid of all of them on the animals and in the cages, there are some just waiting to move back in. A thorough vacuuming, along with laundering curtains, will decrease the chances of this happening. Here again is where you can read exactly how to do all of this:http://www.anapsid.org/mites.html
I know this sounds pretty overwhelming, but there is no easy way, and if the mite infestation gets heavy enough, the nasty little things can even kill your reptiles.
If you have further questions, just let me know by clicking on REPLY. Good luck in eliminating the mites.