I don't have any good solution to the inside and it looks as if the face trim would have to come off to access the aft area and even them, the bottom may not be accessible. If you had a long nozzle for the application, you may could reach the inside from outside.
Also, I have been spraying lithium grease on the racks instead of using silicone spray. I don't have the crunching and grinding using the grease. The lithium grease does not seem to attract dirt and dust once dry.
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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