Today I washed the Passat.
There was some water left over, so I moved on to the Golf3.
Observations from running a wash-mitt over it:
The doors on the offside are rotting bottom-up.
The doors on the nearside are not.
The hole in the offside sill is still there.
There are several significant bodies of water under the lacquer on the bonnet and the roof.
None of this affects the economy of the vehicle, no further action is necessary at this point.