I also have the Kwikee levelers and the manual states that if sitting for a long time it is a good idea to wipe them down using tranny fluid.
Now, depending on where I'm parked will depend on what get's on them. If on gravel, grass, or dirt, and it has rained, splatter "will" give them a light coating of grime. Just a blowing rain will also give them a slight coating. If in doubt, I'll wipe them down just as a precaution to a piece of grit getting past the wiper seal.
Wayne MSGT USMC (Ret) & Earlene (CinCHouse)
2008 Winnebago Destination 39W
It is what it is, and then it is what you make of it.