Clean glued calculators (and similar)
If your calculator got juice (like mine, dried red currant juice sticks so nicely) and then the keys can only be pressed down by force, high-alcohol (the from the pharmacy, not from the home bar!) Helps to the part to make it user friendly again.
Put out the batteries, distribute alcohol on cotton swabs and / or cloth and liberally on the glued areas, especially on the buttons and around them. Meanwhile, press the keys.
Then wait a while, until the alcohol has evaporated, batteries back in and voila: The keys move properly again!
