Sanifair is responsible for the sanitary installations along this service stations. You'll find a chilled out atmosphere (even with music) and mostly very clean and hygienic toilets there, so great to make a break while hitchhiking, even if you only need some fresh water to clean your face/hands.
They created their own concept for paying:
If you want to use the toilets, you have to pay a fee, in most cases this sould be EUR 0,50. You'll get a coupon, and with this one you are able to get a discount of EUR 0,50 at the shop in the service station (e.g. you can get a box of matches for free). It's also possible to collect some more of these coupons, you can convert them all together into one product you might want to buy. The vouchers are valid for one year.
You might find vouchers that have been thrown away by unsuspecting customers. They are most likely thrown into the garbage bins on the way from the bathroom to the car, but it is also possible to find them in the bathroom or even still in the slot of the vending machine. You can also check if someone forgot to take the money from the change tray of the machine.
If you're alone in front of the Sanifair entrance (e.g. at night), you can also jump over the barrier to get into the toilets for free. It's free for children anyway.
Currently you can find more than 300 Sanifair installations in nearly all federal states of Germany.
Even if you don't have to, try to use the toilet, its cleaning procedure is amazing! Don't get up the toilet before you're finished, though.
- Sanifair (German)