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Since you'll be cleaning hair and dead skin cells out of your shaver, you may not want to do it over a floor. Cleaning your shaver over your sink will allow you to easily get rid of fallen hairs and skin with just a bit of water. Some shavers have an on/off switch, whereas others have a switch you depress to activate the blades. Either way, make sure it isn't running; you want to make sure there is no electric current running through the shaver before you begin. If water gets into the shaver, it could cause electrocution or damage the shaver. If your electric shaver is battery powered, you may want to remove the batteries before cleaning it. Since you're about to clean it, you should take a moment to make sure there aren't any cracks in the casing or damage to the shaver head, such as nicks in the blades. If you can see any seals or gaskets, make sure to inspect them for damage.
Hold the shaver over your bathroom sink. Turn off and unplug the shaver. Inspect your shaver for defects.