Did you forget about that full Platy in your pack from last summer? Make them new again with this tube and reservoir cleaning kit.
Platypus says:
Keep your hydration reservoir and drink tube fresh and clean with this easy-to-use 2-brush set. The broad head brush is designed to scrub the interior nooks and crannies of your reservoir while the thin, coiled brush scours your drink tube for a thorough, good-as-new clean.
Platypus's Reservoir Cleaning kit contains a long wiry thingy with a brush on the end for cleaning the tube and a bigger brush for cleaning the bladder. Easy to use and doe's a good job.