Keyboards can become dirty after periods of extended use, especially if users commonly eat or smoke near the computer. If a keyboard becomes dirty enough, its performance can be affected. Common problems include dead or stuck keys and repeated characters during typing. Note that disassembling your keyboard as described below may void the warranty. It doesnot wear out, they foul out. Proper cleaning and lubrication as described here will restore your Laptop keyboard to the snappy and smooth performance it had when new.
In order to clean it, what you will need are:
lint free cloth.
dry cloth or duster.
suitable cleaning fluid (isopropyl alcohol).
cotton buds.
Can of compressed air or vacuum cleaner.
Flat tip screwdriver (optional for thorough clean).
For a quick cleaning, turn the keyboard upside down and use a can of compressed air to blow out any foreign matter. Be sure to do this in a location where falling debris can be cleaned up easily. Turn the keyboard upside down and tap on it a few times. You should see a bit of dirt fall out. Change the angle and tap harder to make most of it get out.
The steps to clean my HP Keyboard is below, you may take it as a reference.
First, shutdown the hp notebook and remove the mains plug, hold my HP 441541-001 keyboard upside down to release any debris from inbetween the keys (pressing the keys is a good way to release it). If you have a can of compressed air then use it to blow any debris from around and under the keys, if not then use the hose of a vacuum cleaner to remove it.
Secondly, clean the keyboard with cotton swabs SLIGHTLY DAMPENED with water. Replace these often and BE SURE they are only slightly damp. If they are too wet the excess water will contaminate the keyboard through capillary action. This will clean all water soluble contaminants like Coca-Cola, coffee, and sugar residue. For the very small places, cut the foam rubber into small pieces and use the tweezers, again SLIGHTLY DAMPENED, for cleaning. You must clean each and every key space, inside and out, this is critical since this is where the key touches and moves.
Repeat this procedure again using rubbing alcohol and cotton swabs but NOT the foam rubber as it disintegrates when used with alcohol.