Interesting. None of mine had removable joints - they have all been the white fixed T piece like David's (a 99, and two 02s). The grey car now has a removable joint I salvaged from something else and the hose runs in from the top so its easier to get to.
This is a typical example of Audi thoughtless design. A hose which becomes so hard with age that its impossible to remove except by cutting it apart, and once you do get it apart, it dumps all the screenwash on the floor. Much schadenfreude in Ingolstadt when they thought up that one.
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