For those less adventuresome, your computer service store will clean your case, for a reasonable cost, far less than the cost of replacing a chip or a pcboard, that failed because of heat. Care should be taken to handle them on the edges only. Keyboard Keyboard maintenance consists of, mainly, not spilling anything on it. If that happens it may be necessary to remove the key's individually. The key's will pry straight up and off on most keyboard's, remember where they all go .
Some boards have screws that allow the bottom to be removed, for dust removal.
Printers Printers require regular maintenance as well as paper. The ribbon will need replacing depending on usage. The print heads on Daisy Wheel and Dot Matrix printers should be cleaned as needed with a cotton swab and a mild cleanser. Bubble and Ink jet printers require new ink cartridges and toner. Toner build up on rollers and print head can be cleaned with a cotton swab and a mild cleanser.