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Topic: board cleaning: When I worked in electronics, I asked an engineer at Kester Solder about board cleaning. He said there was no reason to clean a board of ordinary flux, except for good looks. He said Heathkit and Knight kits were around for years with no cleaning. There have been "No clean" fluxes. They stay on the board and "work" because they are meant to be transparent. Unless you overheat them with an iron. THEN they turn black and very hard to remove. If you choose to go the better route of "lead-free", ask the solder manufacturer if the board must be cleaned.
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