Hanger's Cleaners is located in Mission Valley in the same shopping center as IKEA and Costco. While they are a little pricier than typical dry cleaners, the environmental benefits are worth it. I had a down comforter cleaned here and they did a great job. They even packaged it up in a nice carrier/storage bag that I slid right into the closet until I took it out for winter.
The staff is friendly and helpful and they have multiple registers so there is not a long wait. Easy parking right on front of the store.