I saw an Oprah show last week (pretty sure it was reruns) and there was a woman who they checked her home for cleanliness (germs). She had the same kitchen spoung for years and still used it, testing showed ......"She could drop a carrot stick in her toilet and it would be cleaner to eat then had she washed it in her kitchen sink" The spoung was growing all kinds of goodies even though she washed it in her washing machine. Advice.....change your sponge at least once a month, and wash it in a bleach solution after every use. Then they did her bedroom, pillows were wedding gifts (30 yrs old), testing showed........"She had millions of millions of dust mites living in her pillows, which is one cause of breathing problems people get (asthma). Her mattress resulted in the same condition with dust mites. Advice....... change your pillows when they no longer perform as intended (bend pillow in half, if it doesn't spring back, time for new ones, you no longer have a pillow you have a mat) meanwhile vacume bedding everytime sheets are change. Now this is the reason for the post, my feather pillows are 10yrs or better in age. I do use pillow protecters and wash them with the sheets every week, and air them outside when changing sheets as well.Yet I'm slowly getting a breathing problem so I'm thinking those little critters are doing me in and it's time for a new set of pillows. Now the best part, changing vacume cleaner bags (I clean mine out and reuse till there's a hole and can no longer be used) these should be chnaged once a month. All those dust mites are in the bag and when you vacume your spreading them around through the exhaust. Nice huh? It gets better.......one woman gave her family salmonella posioning 3 times, because she vacumed some chicken scrapes into the bag (germs grew and everytime she vacumed she posioned her family through the exhaust). Heppa filters do help but not the answer, changing the bag does. So what I'm trying to say here is being frugal may not be in the best interest of your family's health.