Many PC gamers prefer using traditional computer peripherals like keyboards and mice for gaming input as opposed to console-style gamepads, often spending a lot of money on the best mechanical keyboards with the fastest response times. However, keyboards present a problem that’s much more pronounced with them than with a mouse or gamepad. It’s easy for them to get dirty, and what makes the problem worse on keyboards is how easy it is for debris to fall between the crevices and under the keys.

There are various ways you can try to remove all of that dirt from the keyboard, but the best and easiest is arguably pressing a piece of cleaning gel/slime against the keyboard and then lifting it up. Usually colored bright blue or a yellowish/greenish hue, you can find containers of this cleaning gel under brand names like ColorCoral — the current Amazon’s Choice label bearer — and Super Clean, but they’re all pretty similar and equally inexpensive.

If you’re old enough to remember Nickelodeon Gak, the toy slime popular in the 1990s, you may have played with cleaning slime without even realizing it. Online recipes for making both at home show that cleaning slime and Gak can be easily made with a mix of water, school glue, borax laundry detergent, and food coloring. So if you get someone some cleaning slime, not only is it useful, but it’s fun to play around with. It’s cheap and small, which qualifies as a great stocking stuffer.