Ma was a big fan of "Maude,"
I was a fan, too, but not as devotedly. I do remember Maytag being mentioned several times a season, but at the time the show aired, Maytag did not have a complete line, just their strength, laundry, dishwashers, and disposers.
The episode I remember most clearly was one where Walter and Maude were at a dealer's convention, and Maude's badge read "Mrs. Walter Findlay," instead of "Maude Findlay."
I remember being utterly dismayed at those MOL Coppertone appliances.
Lawrence/Maytagbear