Like chaudhary i too have been using one since two years now, it still works like a charm.
I was it with hot water in the washing machine at slow speed using lemon max soap or regular surf, then once a month use a fabric softner.
After drying the car dont roll it and squeeze it too much to dry it, ideally dry one pannel with it and then clean all the glass with it, then use it on the body, this how you will have a streak free finish on the glass.
Moreover after washing the car give it a final silver line (just take the water hose and without any pressure let water run on each pannel starting from the roof, this how the car would retain less water droplets thus making it easier to dry).
But in your case i suggest you get a new DT from ahmed bhai and take good care of it, it will serve you well and long.
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