so I made this bottom cleaner out of 2 inch PVC.
step 1, get in volvo or suitable hybrid car, preferably while wearing birkinstocks, your L.L. Bean Maine Hunting coat, your bermuda shorts, and a shirt that says "I'm with stupid"
step 2, mosey, sashay, saunter into your local home depot.
step 3, procure (1) 10 ft length of 2" pvc, grab a 2" pvc tee, a 60 degree elbow of 2" pvc,, 3-2" end caps, a hand full of 12" tie wraps, and a "great big-o" (thats a southern unit of measurement) can of that foam insulation.
step 4, don't forget the glue that welds all this stuff together.
step 5, find an astro-turf house/floor/welcome mat.
step 6, drag all this stuff to the front of the store, pay for it using some sort of legal tender.
step 7, reward yourself on your fantastic purchases with a 4.00 cup of coffee made by some liberal arts major that hasn't figured out that while she is infact liberal, her degree is not an art, and is... worthless.
step 8, note that the floor/welcome mat is either 15, or 18 inches wide. cut 2 pieces of the 10 ft pvc the same 15, or 18 inchs.
step 9, place one of the pieces you just cut into the "thru" portion of the tee. See, fits nice don't it. Ahhhhh. Ok, take it apart and glue those two bad boys together. Place and glue one of the end caps on the pipe as well. Once again... Ahhhhh. Fill said contraption with the foam. Try not to get it on the mating surfaces you have yet to glue, ok? Rinse, repeat with the other piece you cut, the "thru end" of the tee, and the end cap. (fill with foam before you glue on the end cap) Eureka, its coming togther ain't it? Get yourself an adult beverage if so desired, you've earned it.
Heres where it gets tricky, you might have to use some math skills depending on the beam of your hole in the water or, what the hell, wing it.
step 10. Cut another piece of the PVC about 45% the width of your beam. If you have an 8ft beam, your length would be, ... thats right einstein, about 43 inches.
Poke, glue and fill that piece into the only place on the tee you should have open.
step 11. Glue 60 degree elbow to end of the last piece, you can see where i'm going with this can't ya?
step 12. Glue remaining piece of 2"pvc and end cap together.
step 13. Wrap cut pieces of astro turf around the 15 or 18 in. 2" pvc, (pi x radius squared, plus "a little"
) Secure with tie wraps.
throw said device into water, lookie maude, it floats!
Retrieve device, grab non astro-turf side. Push astro turf side under your hull. Notice there is considerable upforce generated by the trapped air and the foam, giving an easy scrubbing affect(effect?).
Stop, enjoy another adult beverage, drink in the remarks of adulation coming from your dock mates. Regal them with tales of sea monsters or ex-wives, offer to make them one of the devices for oh, 100.00, (that usually works better AFTER numerous adult beverages).
Go home, all is right with the world.