A while back ago I had problems with mites on a chuckwalla. I am grateful that my frill seems to be mite free.
A guy in another forum (chuckwallas)suggested I use olive oil. It worked but I recommend being careful with the oil. These were the instructions that were given too me:
"Infested Chuck
1) Give him/her a warm bath. This will wash many off quickly. I even use a little soap and a soft toothbrush. Be gentle
2) Apply some olive oil with a cotton applicator pad to the entire body. Try to avoid the eyes even though the oil will spread over every nook and cranny on it's own with time.
3) Place the chuck into a small box... Shoebox... overnight. I was told to use cardboard as it gives the mites something to bore into as they try to escape the oil! Wood may work to. Make sure to cut a few air holes.
4) Give the chuck another bath with soap and water after 24 hrs.
5) Repeat if mites are still present.
The only side effect that I noticed using olive oil is that it made it very difficult for the chuck to shed when that time came. The oil seemed to "thicken" his skin or something. He is fine and doing better than ever."