I just started doing bottom cleaning in Naples FL. about a year ago. I've found what works best is a multi use paint scraper from walmart for the metal parts such as intake grates, struts, shafts, and props (depending on the prop) as far as cleaning the bottom paint, I use a course pad (also available at walmart) and use it lightly. I bought a hookah system which just consists of a non-oiled air compressor, a 50 ft hose, and a reg. Business has been picking up, as I am getting more and more referrals from customers I have. For anyone looking to get into this kind of business, I gotta warn ya, it's not a very clean and exciting career. It's a bit boring down there, and being under a yacht is not like pleasure diving. Most of the time it's very dark and dirty. I was looking at getting an underwater MP3 player. most of what I have seen go to 10 ft. which is fine, as most of the boats I do go under around 4 or 5 feet. Does anyone have any suggestions of a good MP3 player to get?