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Logitech MX Master 3S get wet and stop working. I have disassembled few times, used electronic cleaner for all boards but no success. Charging light always red regardless how long I am charging. What to do?

Igor Vysoc you did not tell us if you removed those boards. If you did, post some pictures of those with your QUESTION. Adding images to an existing question It is always best to remove and to properly clean everything with some high grade isopropyl alcohol. For a proper cleaning, use this guide. Repairing iPhone Liquid Damage It was written for a Apple iPhone 3G but it is still pertinent to your mouse as well. Truly assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. Once properly cleaned, REPLACE THE BATTERY and reassemble to re-evaluate.