I tend to wash it more often because I switch between water and other powder-mixed drinks. When you switch you either accept the mixing and taste "pollution" o

I tend to wash it more often because I switch between water and other powder-mixed drinks. When you switch you either accept the mixing and taste "pollution" or wash it. Going from something like gatorade to water does not require rinsing. I found that switching from powder-based fiber to water or gatorade does. I tend to schedule these for minimal rinsing though.