The equipment used in these instructions are
A Viper 95mW from Dragonlasers at http://www.dragonlasers.com
A lenspen from http://www.lenspen.com/
A squeeze bulb from ..... (no idea, its being lying around for a long time)
Step 1: Safety First
So unscrew the battery cap, remove the batteries and just to be sure, leave the battery cap off.
Step 2: Good and Bad Ways to Clean a Laser Pointer Lens
Some methods work well, some work poorly and some will even damage the lens. The lens is very easy to damage and many people end up damaging their laser pointer's lens when they try to clean it.
There are only two methods that work well and will not damage the lens. They are compressed air and professional lens cleaning tools such as lenspens.
Step 3: Remove the Lens Cover
Be careful once the lens cover is off keep your fingers away from the lens.
Step 4: Cleaning With Compressed Air
Most of the time, compressed air will clean the lens.
If the lens is still dirty, use the lens cleaning tool.
Step 5: Cleaning With a Lenspen
Very easy to do, just gently polish/clean the lens with the tip of the lenspen. Should not take more than 2-3 seconds.
Step 6: Put the Laser Back Together and Test the Beam
it the lens was just dirty and not damaged, the beam and beam point should now be very clean and have good quality. If the laser still has a problem, the lens is probably damaged.
The beam point should look like the one in this picture. The halo is small and has no scatter or other defects.