I've read where some recommend baby powder on the slide seals, both inside and out, and read where one guy used baby powder on the inside seals and silicone spray on the outside seals.
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'08 Greyhawk 31SS Traded in
2018 MR2410RL
Goodyear Endurance
Equalizer WDH
TV 2018 F150 FX4 SC 3.5EB TP/MT
If it's a Schwintek slide, they warn not to apply any lube to the slide mechanism. A guy at a campground that I used to stay at lubed his slide mechanism because it looked too dry. It totally seized up on him at the end of the season. It wasn't a Schwintek. I don't know what brand it was.