We all clean our offices, bathrooms, houses, furniture, etc., to get rid of all that  Dust & Dirt "D&D" and to reduce colds and allergies.  However, not many people clean their computers or properly maintain them.  Not only should the computer hardware be cleaned, but the software should be properly maintained, organized, and free from viruses.

Hardware

As everybody knows D&D accumulates on everything, therefore requiring cleaning. D&D is potentially fatal to a computer, which is a vital entity to a business. With proper cleaning of the computer, keyboard, mouse, monitor, and peripherals the computer will maintain proper operation and it will last longer. Dust accumulates in all parts of the computer, i.e. CPU fan, power supply, disk drives, motherboard, etc. This  buildup of dust may cause overheating and malfunctions to the PCs vital components. Typing can be very frustrating when the keyboard is not working properly. In most cases the cause for  keyboard problems are the keys sticking due to beverage spills. Paper clips, staples, and other foreign objects may also cause keys from not working, therefore, proper cleaning will reduce frustration.
From a hygienic perspective, a properly cleaned computer and its peripherals will reduce the spread of 
germs.

Software

Since most of us surf the internet, exchange floppy disks, work on a networked environment, and send
and receive email, we are all vulnerable to computer viruses.  Computer viruses are bits of code that are 
potentially fatal to data residing on the hard drive.  Viruses can completely erase all data on the hard drive. Therefore, it is necessary to scan the hard drive for viruses frequently. While you work on your computer files, they become fragmented, meaning data is split into pieces and placed on different parts of the hard drive.  The more fragmented the hard drive, the less efficient your computer is. Defragging the hard drive consolidates files, frees up space, and speeds up the computer.