I have a problem with the case that came with an HP71B I recently bought. According to the s/n of the calculator it was made in 1988 and appears to have been stored unused for most of that time. The interior black lining of the case has a "sticky" substance which also deposited on the calculator. It easily wiped off the calculator using isopropyl alcohol. Does anyone have experience with this, or know if the interior of the case is deteriorating and what can do about it?
HP71B soft case
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