The biggest cleanup issue is the buildup on the heat deflector under the cooking grates. You'll need good gloves and an apron. On most models, a thorough cleanup means a 30 minute process of taking out the greasy grates and the gooey deflector plate, scraping them and washing them. You should do this when the carbon and grease cover the deflector plate. Stainless parts can go in the diswasher, but I wouldn't do it. That grease is like tar and it could get all over the insides of the dishwasher and hang on for dear life. I use a handheld steamer like the Steamfast SF-320 Portable Steam Cleaner shown here.
Pay attention as well to what temperatures your grill can heat up to. Most of pellet grills can maintain a temperature within 160-500 degrees F ( with much more expensive models is even  600 degrees F ). Why am I mentioning that? Because you have to think about what is the most popular grilling style for you. It will influence whether your pellet smoker will be a good choice for you.

4 years ago I made a 700 hundred dollar mistake a bought a China made grill it never worked right from day one. My wife suggested that I should replace it. I decided I wanted a us made grill after seeing the yoder series and all of the great reviews I couldn't wait for it to arrive.so glad a bought the ys640 works like a dream, any one reads these reviews and buys another grill you have made a mistake
Larger, more expensive smokers run anywhere up to 900 square inches, which will basically let you feed your whole street. It’s also a whole lot more convenient when you’re planning on cooking multiple things to be able to throw every single sausage, joint of meat and rack of ribs on at once, flip ’em around and move things to the edge when they’re done.
Your choice of the pellet can also dictate how much cleanup you’ll have to deal with (even though generally 10 pounds of pellets can produce at most half a cup of ash, but this varies from pellet variant to pellet variant). Just be warned that when the temperature is high, there’s not much smoke happening, so you need to smoke out your meats at lower temperatures to get that smoky flavor.
Instead of logs, the pellet smoker is fed with food-grade cylinders of wood pellets that are an inch long and ¼-inch wide and are made of compressed hardwood sawdust. According to the best pellet smoker reviews, pellet grills are easy to use because it’s easier to maintain its temperature because of these sawdust pellets that are subjected to great heat and high pressure, which ignites lignin (natural wood glue).
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