Seems to me that the spirit may be sound but the execution impractical.
What about water ski's, tubes, boat anchors, trolling motors, footwear, drift socks, down riggers, planer boards, fishing line (particularly braid), bilges, water still in outboard cooling systems, landing nets...............and on, and on....
Wouldn't most of the above stand a pretty good chance of being contaminated, even more so than the hull of a boat?