The best way to clean gas fireplace logs is to vacuum the fireplace interior, remove the logs and wipe them down with a damp cloth. It is important for appliance owners to refer to their user's manual to find out if the gas logs can be removed.
Appliance owners should begin by turning the fireplace off, and waiting until it is cool to the touch before working on it. They should then lay plastic sheeting or newspaper on the floor in the area surrounding the fireplace to protect it from soot and other debris.
The appliance owners should vacuum the interior of the fireplace using a vacuum cleaner with a brush and hose vacuum attachment. Next, they should check the users’ manual to find out if the gas logs can be removed, and how to remove them. Some fireplaces can have problems with combustion if the logs are disturbed.
If removed, the gas logs should be scrubbed lightly using a scrub brush, and any debris vacuumed off immediately. Any remaining soot should be removed using a damp rag, unless otherwise specified in the user's manual. Cleaning fluids should not be used on gas logs, as they may react with the flame or gas.
Finally, the gas logs should be returned to the same position once cleaned. Cleaning should be done at least once a year as part of regular gas fireplace maintenance.