Like me, many of you must have struggled to clean up your old calulators with varying success and even causing some marks or damage.
However, my latest attempts have been very successful. Just try a good quality pencil erasor before anything else. I have cleaned several calculators, including biro ink stains and dirt ingrained in the rough surface of the plasic with great success.
My previous attempts have used a soft cloth with warm soapy water, which is good for many things but not biro, and often the plasic surface is left slightly more shiny from the rubbing.
I have used Ethanol for more difficult marks, which is usually ok on the good quality plastics, but be careful!
However an erasor (we call them a rubber in the UK!) seems to work best. The white ones which leave a lot of small rolls of rubber seem to work best.
Any other cleaning experiences others can share??
Old Calulator Cleaning
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