All palm cutting is done with a 44 but I own a 46 for trees and that doesn't get used in palms. Of course the 44 occasionally gets used on trees too.
Sometimes we have multiple jobs with palms in one day.
Sometimes you might have 10 to do and it takes half a day, you aint gonna beat it, corrosion is a fact of life.
Also, having 10 years at this I know for a fact that a regimented cleaning schedule corrodes them faster, of course it will, you open up a new fresh surface more often. I clean now once a week in there and get between 12months and 18 months out of a 44 where as daily cleaning I got 6 months to 9 months.
I even bought a parts washer, real kero and compressor etc and haven't used that set up now for a few years. Now I just blow it out and spray it with INOX.
Also the oil pump corrodes away fast with daily cleaning ritual. I carry a spare at all times and can do a change-over fast in the field.
With daily cleaning ritual new oil pump about every 6 weeks to 2 months. With once a week cleaning about 3 to 5 months.
Leaving the old crap in there forms a barrier against the fresh crap, it only corrodes once, and that first layer becomes a barrier.
Liken it to continually trimming off a branch to expose new wood rather than letting it callus over.
Oh, it also corrodes beneath the paint layer, dont get conned, the paint bubbles off and beneath is a big ugly patch.