Do you wash your pillow or just throw it out? How often do you wash it?

Here's a topic not often discussed! you wash them, and if so how often or do you throw them out?

Check out how one girlfriend cleaned her boyfriends pillows:

I put them in the bathtub with some dishwasher tablets, and then added Borax and some bleach. After soaking she used a mop to wring out the dirt and then finally put them in the washing machine. The results were astonishing, and they actually looked as clean as new, although she noted, "He probably won't notice... but I can sleep better knowing those nasty pillows are clean."