My local cat will let me pet him, but not pick him up or put a collar on him. Lately he started scratching even more than usual. Where he could lick, his black hair turned a brownish color. I got some of the drops you put on the back of their neck, at great personal expense. Seems to be helping, but he still scratches. Today I put some warm water on an old T-shirt and was surprised that he let me wash him a bit. Thinking that maybe I'll get some flea shampoo, put it in warm water on a cloth, and have another cloth with just water, so a little wash and rinse. Any advice on this situation?