We get a lot of printers coming through our shop. Some of them come in with scuff and tape marks.
Here is the four step process I use to clean these discolorations –
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First I use a household cleaner like Fantastik, Windex, or 409. Many case this does the job.
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Second, is use Isopropyl alcohol which is usually safe for plastics
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Third, if the stain is still not going away, I use Ethyl Rubbing Alcohol which is more intense.
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Forth, when push comes to shove, with care, I use a green Scotch Brite pad. I use this sparingly along with a dab of
Isopropyl alcohol.
Warning, use these cleaning methods sparingly and you may want to test the back of your printer first to make sure the cleaner is safe.
Finally, if the discoloration on your printer came from exposure to sunlight, this can not be cleaned away.