Grinding sand is what in talking about. We have sand pits on some corners, when it's super dry.My experience with dry lubes like that muck-off is the instant you go through a wet creek or it starts raining like that, say good-bye to lube. The best for wet like that is goopy-wet lube, it'll look like crap, but it'll keep it smooth. Second are the in-betweens like dumonde-tech and most of the R&R (which I didn't know contains PTFE until just recently) line, if applied correctly before, these will do pretty well IME.
The "dry" lubes are kind of a boggle to me. So you'd think that this would be the ticket in AZ, but if you find ANY water, like we did at 5000' and higher, that one creek pass would screw your chain for the rest of the riding, grinding sand basically the rest of the way. So maybe in a much drier environment, but you really can't go through one of those gritty sandy wet creeks, or it's just done IME. Winter time in snow...well dry works, anything works, rarely have to apply lube of any kind.
The mucoff c3 doesn't seem like a true dry lube, it stays kinda wet. But yeah might be time to try something else. But, I do hate the drivetrain looking like shit.
Yeah also strange how winter riding works. I lubed the fat bike once last year and that was it. Probably still good to go.