Howdy! I bought my 2 Star last March, and have cooked lots and lots of food on it over the year that I have owned it. I am pretty picky about keeping my stuff in tip-top shape...lol. I have tried numerous cleaners on the exterior stainless, many that came highly recommended on several forums. After a year of trial I have settled on 2 cleaners that make keeping my MAK clean a breeze. I use a product called SD-20 after every cook. Most of the time, while the cooker is still warm (not hot), I spray it down with SD-20 and then wipe of with a damp microfiber towel. I then rinse the towel with fresh water, ring it out and wipe one more time. The whole process takes maybe 3-4 mins. And then once/month or so, I will spray any tough grease stains down with a product called Mr. Muscle, and let it sit for about 5 mins. The grease stains wipe right off with paper towels. Sometimes I have to give a second spray on the really tough spots, but they always come off.
I am always careful to quickly wipe any overspray from the power coated lower portion of the cooker.
You can find both cleaners on Amazon. They are a bit pricey, but they work!