What's the best way to...

[YamahaFreak]

...thoroughly clean a grubby, dusty circuit board, without damaging the board or its components? I've struggled with this task several times in the past, trying everything from a simple toothbrush to the leaf blower, but the particularly stubborn ones never 'come clean', so to speak. I even followed some advice to hose a board off once, though I apparently didn't do it right, as the flyback got wet and shorted. Not doing that again