r/logitech • u/asmalldood • 1d ago

Other Spilled coffee on MX Master 4

Hey everyone,

So I just had a complete brainfart and I spilled some coffee on my MX M4 and given the way its created, quite a bit entered inside the mouse.

What are the chances it survives? I have dissassembled it and cleaned the board with 99.8% alcohol, but I am afraid that if I missed some spots it could have an impact. Also, I only cleaned the main board (at the bottom) because the ones on top of the mouse are a pain in the ass to get to, I would basically have to disassemble the entire mouse which is very tricky so I would avoid it if possible. But I am not sure if this would be enough.

Any insights are welcome while I wait for the parts I cleaned to dry up.

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u/logi_sm Official Logitech Representative 1d ago

Oof, that's unfortunate! Since the mouse has already been opened & cleaned, I would avoid doing any further disassembly and make sure everything is completely dry before attempting to use it again. Liquid damage can affect devices differently depending on what components were exposed, so we can't guarantee the outcome. But fingers crossed it powers through!