You can use the wrist straps. Start zapping a minimum of once per day.
You can zapping several times per day. The less PCB's in his system the more flow will go through his body. You can help him to prevent getting PCB'S by using only Borax soap for washing dishes, clothes, and himself.
You can read Dr. Clark's books online to get more tiips on toxic cleanup.
You want to buy orthinine to help him sleep at night, because at the zapping kills parasites which release ammonia. Orthinine will detox the ammonia.
I have read that Dr. Clark uses a zapper, and a frequency generator set at a specific frequency at the same time on some patients. I've included a website that you might like to do some research on the frequencies.