A lot of the women that Müller junior and Beretin welcome to their clubs only come to Germany for eight weeks.
Tucked behind some trees, amid the chugging machinery of a steel works and the smoking chimneys of a rubbish incineration plant, is a small loop of road fenced off by barriers.
The going rate at Paradise is about 50 euros for half an hour, slightly cheaper than the hammam — another extra — which is offered at 53 euros for 30 minutes.
There are around 30 caravans here.
Saarbrücken is a small city of 180,000 inhabitants that happens to be just five kilometres from the French border.
The women at Geestemünder Strasse are the lucky ones.