I got my MES 30 from Lowes about a month back and have been using it every 2-3 days. I don't wipe the down the walls but I wash the cooking grates/water pan/bottom drip pan after every cook. When I was preheating my MES 30 today I saw that there was thin smoke coming out of the exhaust vent even without chips/food/grates inside the smoker... I'm assuming that smoke is made up of the built up grease or whatever is stuck on the walls of my smoker... What would be the best way to do a deep clean?