I am known for cleaning, but I do not clean myself. You might find lead on me.

Three white faces are named from me. Two skeletons and a mystery. I'm in word, writer, and docs galore. I've scripts and serifs and so much more. I'm art that brings life to your words, so choose me well or look absurd.

You look upon my face and hands. I replace old falling sands. Sometimes I make a little sound. Your home is guarded by my hound. I hang or stand upon my feet. And on your wrist, I'm pretty neat.

The longer I live, the shorter I grow. When day turns to night, you welcome my glow.

I contain all the past and present, and the future will be soon. Every spoken word, every written character will be somewhere in me. I am a being of sacred knowledge, where you will discover things other people only dream of finding. What am I?