If you've had to pull the sail switch and clean it that much, I'd first look at the cutout in the metal wall where the switch is mounted to see if there may be a bend or a shard of metal that catches dirt/dust causing the switch to bind. Possibly file the edges of the cutout opening just to make sure it's smooth.
Then, if the switch is binding that often from foreign "stuff" on the switch, I'd look at the return air pathway. I'd suspect that there is a "pocket of construction debris or other debris" that is "fueling the issue"....
As a comparison, we have/had until recently a GWP, who sheds terribly, sleeps directly in front of the furnace return air intake and in 6+ years of owning this trailer, we've never had a "fouled sail switch".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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