A treadmill is a significant purchase for most of us. So, to extend the life of your treadmill (and really get your money's worth), it's important to maintain all parts of the machinery, including the belt. The key is to keep it dirt and dust free since lots of build up can slow your treadmill down and cause it to deteriorate more quickly. An easy way to tell if you need to clean your treadmill belt is to walk on it at a setting of four miles per hour. When you press the stop button you should be able to take a few more steps before it quits running. If it stops instantly, there is probably dust and dirt build-up causing a friction problem. That means it's time to clean.
Unplug your treadmill to avoid any electrical injuries.
Remove the treadmill deck from the belt. The deck is the two pieces of plastic that line the outside edges of the belt. Not all decks are removed the same way. Some slide off, while others need to be unscrewed. Check your manual.
Wipe down belt edges with a clean, dry washcloth or towel and wipe the area down to remove any dirt and dust that has accumulated underneath the deck.
Vacuum or wipe down (with a dry cloth) the entire belt. Make sure to get every part of the belt by plugging in your machine and rotating the belt so that the bottom portion can now be cleaned.
Repeat this process once a week, or more if you live in a home or area where dust and dirt accumulates at a higher rate.