Regular gas fireplace maintenance?

I have a Superior DS-36R gas fireplace in the house we just rented a few weeks ago; don't know the age or installation date. The blower (uming there's one in there) never comes on and the gl front is clouded. Can anyone point me to a website/mfr with a users manual or share from experience? I would like to take the gl off to clean as well as troubleshooting the fan.