Clean Your PC - A How To

Cleaning out your computer doesn't have to be a daunting task; Maximum PC does an excellent job of walking you through a step-by-step tutorial, which breaks it down into small chunks.

They even tell you how to make an excellent computer filter from items you probably already have at home. From the webpage:

Every computer collects dust over time. When the computer is running, it creates a field of static electricity, which in turn attracts clumps of dust and hair. These cluttering particles can easily collect around your processor, power supply, and case fans, and can block airflow and lead to overheating. This is why an important part of taking care of a computer is making sure that it’s clean.

And overheating can drastically reduce the life of your  computer. Read on to learn how to tackle this job, and extend the life of your computer.