Spiders in the BBQ
If you suspect that you have a spider web blockage, turn the barbecue off and let it cool completely. Remove the burners in question and clean them with a venturi brush. A venturi brush has bristles on a long flexible rod that allow you to scrub the inside walls of the burner tube.
In the event of a full-blown flashback fire, turn off the gas supply immediately. In most cases, the fire should subside right away. If it doesn’t, time for for the fire extinguisher. Once the fire is out and the barbecue has cooled down you will need to inspect the hoses, valves and knobs for damage. If any of these parts have been damaged they should be replaced before grilling again.
To make your grill spider-free, it is recommended that you make cleaning the burners part of your regular grill maintenance routine.
Information source: grillersspot.com