Climate and it's effects on Pillows and cushions

Many people wash their clothes usually after one wear. But with pillows and cushions, you can wait for a longer period of time before washing it, but the question is, how long? Many people wash the cover of their pillow every month and the pillow itself every 3 months. For outdoor cushions, it's different. It depends on the climate of your area. If you live in a sunny area with little or no snow and dry air, then you can wait years before washing it. If you live in a humid area that can snow, then washing it every other month would be wise. It is also wise to purchase all-weather outdoor pillows and cushions.