Each gas fireplace owners manual will advise to have the unit serviced annually, Here are some signs that may indicate your gas fireplace is ready for a cleaning:

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#1 - Pilot will not ignite. This can mean spiders and/or insects have gotten inside the gas valve and has clogged the pilot light therefore must be cleaned out to get the unit up and running again. 

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#2 - Any visual residue such as soot or carboning inside the unit or on the glass.

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#3 - If it has been over 2 years without having the fireplace serviced/cleaned, it is highly recommended to have professionals come out and thoroughly inspect and clean out the unit, leaving it looking and functioning like new. 

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