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Tesla recommends cleaning/lubricating the brakes at least once a year or every 12.5k miles. I'm in VA and haven't gotten mine done yet at 18k miles, so I'll probably get it next month. Tesla or a shop that is *very* familiar with Teslas can do this. Wouldn't take it to Firestone, though.
I'd probably get it checked, tbh. 90k miles in snowy weather with no cleaning/lubrication could have caused some damage, but based on what you said, you haven't noticed issues with the brakes...