crwdns2934241:0crwdne2934241:0 bill

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The fact that the system was off may be your savior. At worse, only the 5V needed to start the system was there. The CMOS battery is likely too low a voltage to do any harm. Baking soda it more conductive in liquid form. So, residue powder isn't much of a concern. BUT, I would do what Mike indicated and wash the board and THOROUGHLY dry it, for a couple days in the Sun.

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open