You want a dry spray lube that will not attract dirt, as you mentioned. Several years ago the Keystone Service Center technician took the slide dry lube I bought from Camping World, sprayed it on cardboard, threw dirt on it. The dirt stuck. He then took his can of TFE 101, did the same test. No dirt stuck. TFE 101 is just one product that works well. You can use any that meet the above test. I've only found TFE 101 online so have been purchasing similar products in local stores. The difficulty is having to pay for a can of a product before you can test it. Good luck.
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