Before you go any further, the most important thing you need to do is disconnect the propane tank. Close the valve on the tank, unscrew the regulator and move the tank outdoors and as far from your work area as you can. Propane should not be stored in enclosed areas and should not be anywhere near any type of ignition source. Once you’ve disconnected the gas and stored the tank, you need to make sure that you’ve turned the control knobs to the off position. Then, remove the knobs and the control panel to gain access to the gas valves and ignition switch.
If you've been using your BBQ for the day, once it has started to cool down, cover the grill with water-soaked newspaper and close the lid. Leave it shut for 30 minutes to give it a good steam clean. Unless your BBQ is huge, the hotplates should fit nicely into the dishwasher. Set it to a pot wash cycle and they should come out as new. Again, try to clean them whilst warm to get the best results. While there’s still some heat in your grill, attach an onion to a fork and rub over the hot bars. The water in the onion steam cleans them and removes any stuck-on food. Mix 500ml of vinegar and the same amount of water in a spray bottle. Spray the solution onto the grill and leave for 10 minutes. Empty the bottle, refill with vinegar, spray on and then scrub to clean the grill and its interior. Try soaking your grill and utensils in coffee for hard-to-remove food remains. The acid in the coffee loosens up the caked-on dirt. Sprinkle baking soda on the grill and dissolve some in water. Use a sponge with a scourer to scrub until all the baking soda is gone and the grill is sparkling. Pour half a bottle of beer onto a warm grill and scrub with some newspaper or a wire brush. In no time, your grill will be sparkling. It’s important to remove old ash and coals before you start cooking again. Tip them into a bucket and use damp kitchen towels to pick up any remains. Then give it a good wash down with warm, soapy water. Scrape fats, oils and grease that have cooled into a container or newspaper before binning them. It's a good idea to keep a ‘fat trap’ or container in the kitchen to collect waste fats, oils and grease. Many water companies will provide you with a free fat trap. Mix cooking oil with absorbent material such as cat litter or coffee grounds, and then throw it away in the bin. Once the inside of your BBQ is sparkling, don’t forget to give the outside a good wash down. Hot soapy water and plenty of elbow grease is all you will need for this.