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The canopy on my Zodiac was coated with engine oil which had been sprayed by the prop blast during initial run-up testing. On top of this oil was several months of accumulated garage dust, grit, and debris.
I've noticed a rather disturbing tendency for visitors to rub the canopy in what I believe is simply an instinctive desire to make a clean spot. Given that it's summer now, there are more people stopping over, and more people wanting to reach over and wipe off part of the canopy - and possibly scratch it.
It was just a matter of time before some idiot scrawled "wash me" on my canopy - possibly scratching it and annoying me forever. So I figured I'd better clean it.
I didn't dare rub the canopy with anything as that would just scratch it from the accumulated grit. I figured that "flowing" the oil off with soap and water was my best bet.
Then I found an old spray bottle and filled it up with a mixture of Dawn dish-washing liquid and plain tap water. I remembered an old documentary on TV where they said that Dawn was one of the best grease cutters out there, so after testing it on a piece of scrap canopy material I figured I'd give it a try.
Then I hosed it off with a garden hose.
One thing I noticed was that there was a lot of crud *inside* the canopy as well. No idea how the inside got so dirty, but it did, so I gave the inside the same Dawn-water and hose treatment. I do keep the canopy propped open quite often, so it's possible that normal dust accumulates there as well.
After hosing it off for a while, I could see that all the oily crud was gone. I let it drip-dry for a while, and then very gently wiped it off with a soft cloth. I wiped in straight lines starting from the "focal point" at the top and going straight down. This was "just in case" I made some scratches, so they would be less visible while in flight.