I find mine need a clean once every 2 years or so, but it depends how much dust there is where you have the machine. Follow Formlabs’ instructions to the letter and then do an optics test print. If it doesn’t come out properly, clean it again. Get it right and your machine will be as good as new!
Using an air cleaner to remove dust from the air in the room should help, and I bought a small battery powered vacuum cleaner which I don’t use for anything else to hoover dust away from the main mirror before using the pecpads. Reduces the risk of scratching it, since the reflective surface is on the top of the mirror and is easily damaged.
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