i used my Char griller smoke w/ side firebox as a charcoal grill last night. Ive done it in the past but I guess I had a ton of grease in it from recent smokes. The grease lit up realy quick and temps were extremely high. Closed the dampers and the stack but it wouldn't go out. After I waited about 10min, it didn't look like it was burning out soon and didn't want it to get out of hand, so I hit it with a fire extinguisher. Tons of nasty black smoke was filling my yard. Now whats the best way to clean before my next smoke?