Washbasin - Water always flows to the back

If I dismantle the sink. It is glued to the cabinet with silicone. Can you then simply glue it back with silicone? Silicone does not stick to silicone.

yes, but you have to remove it very, very thoroughly beforehand.

I just looked at that. Did I see correctly in the photo that it goes slightly upwards at the side and back, or that it has a slight bulge around it?

Slightly. I would say about a millimeter. I wouldn’t call it a bulge either, but a curved edge. Apparently, it prevents water from dripping down there quite well...

Next to every washbasin hangs a cloth (Geschirrtuch) discreetly. Everyone who washes themselves then briefly wipes the ceramic and faucet with it. This way, everything is always dry and nicely clean. This process has now become so much second nature to us that it doesn’t require any effort at all.

With us, a cloth (tea towel) hangs discreetly next to every washbasin..

With us, the hand towel is taken very noticeably for drying ;)

A proper ceramic is supposed to clean itself or not get dirty in the first place!! Cloth or no cloth :p No, seriously. I do a thorough cleaning every few weeks, otherwise not at all. It doesn’t always have to shine and sparkle, don’t you have anything better to do ;) ?

flashing and blinking

Wrongly understood! The water is wiped away, so you don't have to clean excessively "properly" ;)