@jasminemcmahon30, yep. All the inexpensive pillows. I just wash two at a time on the gentle cycle. Tap / Cold water. And then tumble dry on low / no heat with the tennis balls. Sometimes it takes four or five cycles in the dryer to completely dry.
I buy super expensive pillows for our bedroom, so those I have dry cleaned. But, the pillows in my daughters room, and in the guest rooms I just wash and tumble dry on low with tennis balls in the dryer once a month. I also have two sets of sheets for each bed in the house, and those get switched once a week.
Yes, I do an extra spin cycle to get all the excess water out. I also throw my converse in with them so when I toss them in the dryer they done come out all lumpy.