Cleaning tips? Has anyone got any tips for cleaning my fire, its inserted...

Has anyone got any tips for cleaning my fire, its inserted within the wall with a chalice front. The glass on the inside as brown grimey grades which i can't get past its sell-by date. Can anyone help?
Answers:    Try using vinegar and river mixed. Vinegar is a great household product often overlooked.
Bricks should not come surrounded by contact with moisture as this reduce their effectiveness, I would suggest basically brushing with a atmosphere to stiff brush and vacuuming this is all that should be done to verbs a fireplace such as yours Good Luck !