My prop is fairly close to the surface. I only need to stick my head down about a foot to reach it. It's just about 8" too deep with arms extended to be reached without going under. What I did was to attach a 13 inch piece of hose to the end of my snorkel with a hose clamp. I then tied the skyward end to a fender to keep it above water. I then had my wife hold the snorkel leash just in case it decided to dip under the surface. I was then able to wrap my feet around the prop apeture & rudder (rudder attached to full keel) duck my head down below normal snorkel depth with both hands free to scrape the prop without coming up for air. It worked great. I was even able to change the zinc at the end of my MaxProp (three bolts). It's amazing that just being a foot under water did make it a bit difficult to draw breath because of the increased pressure.
Someone told me what I did was dangerous, but he didn't know why. Anyone know it this is true?