Steve's Place@Mrfunkedude I use 99% isopropyl undiluted, usually. You could use it on a circuit board, but to be extra-clean, spritz it with some distilled water afterward. You want to avoid salts creating circuits. To my knowledge, isopropyl evaporates cleanly enough. It's fair for cleaning tape heads. I use it to clean mice and keyboards. Just a moist soft towel for screens.
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