The lower the % the more water that will be left on the board. The alcohol should all evaporate off rather quickly. I doubt it makes too much of a difference as far as hurting the board is concerned though. We sometimes run circuit boards through a dishwasher too. The higher % will clean much better. 70% and lower is mainly for cuts and scrapes. I got electronics grade in a cut once...@$#@$#$@
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