I clean my UDS by just rinsing the inside with the hose and letting it dry. Then, I rub it down inside with vegetable oil. I wash the grates with soap and hot water then rub them down with oil.
I clean the inside of my Bubba Kegs by brushing out all the ash then rubbing the inside down with vegetable oil. I clean the grates by cranking up the temp to as close to 800 F as I can get and brushing them. Then, I cool it down and rub the grates with vegetable oil. I clean the outside with disinfectant kitchen cleaner.
Operation BBQ Relief Founding Member - I am Obsessive Compulsive about BBQ. Google it.