Usually Sanifair is very good. It was much much worse when they did not exist. Pay toilets are a blessing. Usually there is somebody around just ask them. If you cannot find anybody maybe complain via the website https://www.sanifair.de/kontakt/feedback/
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@Thorsten_Biegner Absolute bullshit. They are not a blessing, and as someone with stomach problems, they're sometimes hell. Germany could learn a lot from Japan. Or Canada. Or really, most other countries, in this regard