How do I add redex to my tank with a capless/antiwrongfuel filler system?

[Monksey7]

Hi, I am thinking about trying some redex diesel additive/cleaner in my 2.0 A3, however I am unsure on how I can get the redex into the tank as the fuel filler is one of those antiwrongfuel ones. Does anyone know how I can get the additive in?

[Steve Q]

I can say the Redex is good and found it slightly improved the drive of my a6. But I'm unsure how you'd put it in your tank I'm affraid. Sorry.