glass doors on the upper cabinets stay cleaner than I'd expected, maybe because they're so far from the cooking source. I go up and wipe them with glass cleaner once every 3 months or so, though they barely need it. There's a microwave now where the cookbooks are shown, with just half a dozen books
glass doors: they hold the things we use on a daily basis, and few items sit around long enough to need dusting, though I'll give the shelves themselves an occasional wipe when I'm putting dishes away. I'm wondering if the kitchen residue you're referring to is the result of a 'circulating' or 'ventless'