POOL NOODLE.... thats the answer!!!Sure this has been done before in some form...I made a bottom scrubber out of 1.5" PVC. Handle is about 4' long and goes to a 45 bend and then another 2' to a Tee. The other Tee extensions are 1" and about 18" long and just fit inside swim noodles for flotation. Wrapped some synthetic indoor/outdoor carpet remnants around the noodle. Handle lengths vary per boat...
Ive wondered what I could slip over the fiberglass extension handle of my bottom scrubber to hold/float the brush up against the bottom so I could just scrub away without needing to hold it up against the hull.
It would be nice to see a photo of what you have designed to scrub the bottom... it sounds as if it may work better than a long broom handle

