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I was told by Keystone's Service Center to use a dry spray lube that does not attract dirt. To demonstrate, they took the slide lube I had bought at Camping World, sprayed it on a piece of cardboard, then threw dirt on it. The dirt stuck. They then sprayed a piece of cardboard with a spray lube they had and the dirt did not stick. That particular brand was TFE 101 but there are others just as good. A teflon-based spray seems to be a good one.
Since I started using a spray that does not attract dirt I don't have to clean off any debris before lubing. Mabye if there was much or something but not normally. I try to lube it about once per year or whenever it starts to jump a little when moving the slides. Like Don said.
I think the key is to test the lube to make sure dirt does not stick to it. Otherwise, dirt will stick to your slide rails and get into the gears. Not good.
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