Be VERY careful with acetone, it can take the original paint along with the grime...
Don't just mix them all together.
Car wash soap is the mildest, then dawn, both mixed with water. Rubbing alcohol is pretty handy, it won't harm the paint, but will take off more stubborn goo's in my expereince. I reserve acetone for those really stubborn spots. Put it on a paper towel or the like, don't pour it on the box. Gentle rubbing then wash with water after.
Simple green full strength is good for removing paint if a box has been repainted with some cheap paint. You really have to be careful with general cleaners like 409, simple gree, purple power, etc they can be pretty hard on factory paint if left to sit for some time.

$50? Yea, you ****, especially in that condition
Fantastic deal.
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