When the grill is cool, remove the grates and flavorizer bars and put them into a full bucket of soapy water. Let them soak for at least 15 minutes. Remove anything else from the grill that you can take off without tools, like burner control knobs and the grease tray. This will make it easier to clean. Most gas grill burner tubes are removable as well (look for simple cotter pins on one end, although some models use screws).
With the grates removed, brush down the inside to clear out any loose particles that have collected in the bottom and around the sides. Scrape off any large peeling flakes of carbon and grease and if yours is a charcoal grill, empty the ash catcher. Don’t forget to clean the drip pan and grease cup in warm soapy water and line them with aluminum foil so they’ll be easier to clean next time.
Cookout season is just a few short weeks away, and if your gas or charcoal grill is still covered with the remnants of last year's cheeseburgers and Hawaiian chicken, now's the perfect time to give it a refresh as part of your spring cleaning routine. These speedy tips from the Good Housekeeping Institute Cleaning Lab come from years of testing outdoor grills as well as the cleaners and tools you need to keep them working well (and your food tasting great).
Inspect your burners for signs of corrosion or anything blocking the row of flame holes. Burner tubes are inviting spots for spiders to lay eggs if your grill goes unused for a while. Use a wire brush and clean them by brushing back and forth over the holes, not down the length of the tube. The wire bottle brush can clean out the inside of each tube.
When finished, you’ll have ears of corn with varying degrees of husk and silk clinging to golden, lightly charred corn and you’ll probably be wondering how the heck to husk it. Remove the ears from the grill and cool for five minutes. Then you should be able to easily pull back the husks and silk. Use a clean kitchen towel to wipe away any unwanted silk or charred husk flakes.
For metal and cast iron grill grates, coat lightly with a high temperature oil like Canola or Peanut oil – wipe off any excessive oil, install the grates and fire up the grill.  Heat the grill on high and let it burn for ~30 mins.  This will burn all the solvents and impurities off of the heating elements, grill grates, etc.  Note that porcelain grates won’t need a coat of oil, but will benefit from the burn in process to remove any chemicals/impurities that were applied by the manufacturer. 
Check the fuel lines for visible defects. If any fuel lines have unmistakable damage (like rips, holes, cracks), replace the parts immediately before your next use of the grill. Also be sure that any fuel lines have a smooth trail. You don’t want any of your fuel lines to be bent, because that will prevent the gas from flowing correctly. Check the exterior of the gas tank for any damage as well; things like dents, erosion, punctures, or any evident signs of damage. If you find areas that have obvious damage, you could potentially have a gas leak.[5]
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