George Farmer said:No, don't rinse it.
Just fill up your tank VERY slowly to prevent clouding. Rinsing it will wash away a lot of the 'goodness'.
vauxhallmark said:Did you get it second hand?
When I bought it it had quite good (translated from Japanese) instructions included on a sheet of paper inside the bag (which you won't have seen if you haven't opened yours yet!).
Mark