Discharging the toilet is no longer possible here. Only water for €1,- for 5 minutes. It is a pity that the discharge is no longer possible.

now only fill up with water but do not discharge anything.

in the car wash at this gas station service: discharge water and toilet. For €1 five minutes of water. Exact location is the RV wash area, to the left of the BP store. There is also a staircase for washing.