Permethrine works well. I use the Walgreens brand of 1% cream. It is $15 for 2 two oz bottles. You mix one 2oz bottle in one gallon of distilled water. Then just pour the mixture into a spray bottle. You can directly spray the animal and make sure you coat the entire enclosure, inside and out. Usually one treatment is enough as this stuff continues to kill after it has dried. I use it now preventatively every couple of cleanings. I have had no problems using on my very young to adult boas. The mites hate it though....
