Does anyone else clean the linear motor rails?

Yes. There was an FAQ on how to do it but it looks like it’s been taken down.

There is some some discussion of disassembly, clean, and lube here: How to maintain the snapmaker in perfect condition?

There’s some disassembly and reassembly instructions spread over the faq: Snapmaker 2.0 – Snapmaker

It’s not hard to remove the steel strip and blow out with gentle air then retighten strip.