Change them after a year or so, I try to clean them straight away! An old housemate left one once for four days in his room in summer, when he came back it smelt like what could only be described as bigfoots nobcheese
I have six on rotation all the time because of how I make my shakes up. Between the eggs/cott cheese/protien powder/juice to flavour one , which I make up three of these at a time and the Tuna/jalepeno sauce shake which I make up two of at a time.
Any way they go into teh dishwasher and have no probs ............the oldest one I have must be 8 years old
LOL at topic. I've got the exact opposite. I put BBW's banoffee in empty bottles and then shake as needed, then wash the bottles after. Haven't used my machine blender to make a protein shake for about 4 days or even a week. Today the machine blender was smelling like "death".
I was thinking of getting a shaker but seeing this topic I might as well continue with my home-made shakers. I got the idea of putting powder in bottles from those RTD protein things that people are selling.
I might not look as posh as the maximuscle shaker boys in the gym but it works and its less smelly too.
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