If your computer screen has more fingerprints than a CSI forensics lab, it may be time to consider giving it a proper wipedown. Remember, computers are an expensive investment, so it's important to keep them clean and well-maintained. Otherwise, you'll be needing more in-depth computer repair faster than you can say, "I'm innocent!"

First, you need to figure out what type of screen your computer has. If it's an older desktop, the screen is likely to be a glass cathode ray tube (CTR). If so, household cleaning solutions that are alcohol and ammonia-free should work just fine – just be sure that everything is unplugged first.

Newer desktops and most laptops, however, often have liquid crystal display (LCD) screens. These screens are much more fragile. First, shut it off. Using a lint-free cotton cloth (microfiber works well), wipe the screen with a light, circular motion. Be careful, but patient: too much pressure can damage the screen, but usually if you keep wiping, the grease and oil will gradually come off.

If marks remain on the screen, you can lightly dampen the cloth with water, preferably distilled water. If it's really dirty, you can apply a very small amount of isopropyl alcohol onto the cloth, dilute it with more water, and try that, too.

So, just to reiterate:

• Shut off your computer
• Use a lint-free, cotton cloth, like microfiber
• Wipe with a light, circular motion.

• Use paper towels or bath towels – they can scratch the screen
• Spray water or any other liquid directly onto the screen
• Apply too much pressure when you wipe the screen.

If you're still having trouble with marks on your screen or other computer issues, you may want to trying contacting your local Maryland computer repair service.