Which program do you use? I use Gimp, which has been very useful for cleaning these up. Using the Color Tools and Filters becomes very intuitive
EDIT --
On some of my earlier clean-ups, I found that I would clean things up too much. I tend to leave some of the 'character' now more than I used to, fading it out rather than erasing, except in the background, where white should be white
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A fine is a tax when you do wrong.
A tax is a fine when you do well.
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