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It's hard to go past the ol' tried and true method of Simple Green and warm water.

I would think WD-40 is quite unsuitable as a protectant, I've never used it as a protectant. It's an excellent degreaser and moisture and adhesive remover. As you said, it leaves a film residue behind which has an unpleasant smell and actually attracts dust. As such, WD-40 isn't recommended as a lub...