Cleaning as in wiping the dusts off from your hardwares. We all know that those blowers inside the CPU causes dusts to form within the heatsinks and to the board itself. Note, not the scan antivirus that your thinking. ;)

How often do you open it up and vaccum/wipe off those dirts accumulated inside? Do you use any cleaning liquid or waxes to keep the casing clean?

How often do you clean your monitors? Most often than not, I always see fingerprints on the screen (my monitor doesn't have touchscreen option).

Do you use cable ties or tie twist for those unruly cables behind the CPU?