If you've purchased a new Weber grill, the company says that seasoning the cast iron grates isn't necessary. A porcelain enamel coating is already added to the cast iron so you don't need to season it at all. Instead, they recommend that when using a grill for the first time, you turn up the heat for about 15 minutes, then brush it clean with a stainless steel bristle brush.
No matter what you are grilling, you should always begin with clean grill grates. Not only does this make it easier to flip and remove the food from the grill but it also does not impart any flavors from previous grilled meals, such as barbecued chicken, into the steaks. Make sure to clean your cooking grate using a stiff wire brush. It is best to do this after you've finished grilling while the grates are still warm, but you can also clean the grill while it is preheating if you discover caked on residue. Taking the time to brush off old bits of cooked-on food will pay off handsomely when your steaks release from the cooking grate with ease.
Learning how to clean your gas grill is important. Whether it’s before or after grilling out or even preparing for winter, there are a few helpful tips and tricks that can make cleaning a grill easy and efficient. The Home Depot is your source for all of your grill cleaning needs. We have grill brushes, grill cleaners, grill cleaning pads, and so much more.
One school of thought suggests that applying the pepper before cooking can cause the pepper to burn while you cook it, imparting a bitter flavor. Followers of this school suggest grinding pepper onto the steaks after searing them, or right before serving. The other school simply seasons their steaks with freshly ground black pepper before cooking and doesn't give it a second thought.

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. 
In lieu of fully re-seasoning your grill with each use, there are simple steps you can take to maintain and care for the condition of your grates. After each use, take a moment to run the wire brush quickly over the grates to clear away any immediate drippings. The heat in this case is helpful for removal when in smaller portions and in the moment. In the same step as above, use a pair of kitchen tongs and a paper towel to coat a layer of high heat oil over the cleaned grates before closing the grill top to cool.
Clean out the burners and venturi tubes. The venturi tubes are the pipes that go out from the burners and connect to the grill control valves. These tubes allow the air and gas to mix together, altering the intensity of the flame.[12] Remove the burners and venturi tubes, and place a hose head at one end of the tube.[13] Turn the water on to clear out any debris or insects that could have gotten inside.
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