My Hamsters Have Mange: Scabbing, Fur Loss On 99% Of Their Bodies. It Started With Mites And In Spite Of Costly Treatment Did Not Get Better For A Long Period Of Time. What Can I Do To Make Them Better?

First of all I will recommend you an effective product that is MAUI WOWIE MANGE BUSTER. If you do not want to go for it then you can follow the following procedure to help your pet:
Just small amount of vinegar to your pet's drinking water in order to combat fleas and mange. If not then you can mix oil with vitamin E, warm it until it reach the temperature of its body. Then pour a drop or so in its ear and massage its ear canal for about a minute. Then gently clean the opening of the ear with cotton to remove all the debris there. Use almond oil and continue this procedure for 6 days. It will help your pet a lot.