I have had more plumber calls in these 5 years in Argentina than in 30 in Italy. I have no idea why it is such an issue here.
In the apartment where we are living right now, they made a sort of plateau below the sink to give more slope to the drain. However, if I use too much dish soap, the foam will pour outside of the plateau!
Also, we have a small kitchen and a sort of kitchen island in front of it, very long, connected to the wall. (not free standing like a proper island).
This Island just had a granite top, very good looking, but was completely bare at the bottom. The previous owners put there empty bottles, the vacuum cleaner, the bucket etc. all in plain sight.
When we moved in, we needed appliances (a dishwasher and a washer-dryer) and not only we realized that the island's top was about 3 cm too low to fit standard appliances, but also that unlike all other units in our building, they forgot to put the drain below the island.
So we had to call a plumber to come up with a solution - imagine this: you have a kitchen against the wall, with the sink and its drain. In front of it, the kitchen island with a missing drain. We just needed a 50 cm pipe from below the island to below the sink but there was not enough slope. However, below the sink, the fitting was already with to inlets (one from the sink, connected, the other for the facing washer, capped).
So our plumber said we had to do a pipe around the whole kitchen, actually two pipes: one for the inlet and one for the outlet. He did all the plumbing with those plastic pipes that are fused together at the fittings/joints. Except that no water was coming out. Of course, it never occurred to him to try if it was working before cementing the pipes inside of the wall...
He said, instead, that maybe the paper clog he put while working (and forgot in there) needed to melt and that it was just a matter of time. He said to keep the water valve open, so that the water pressure would work its way inside of the pipe. But the pipe was barely dripping, never getting to a full flow required to connect appliances. So he said to try and suck the pipe... We blow jobbed the pipe for a week like two morons, but the water was still non existent. After much attempts to get ahold of the plumber, we convinced him to come back and have a look at it.
Finally, he had to tear down the wall again and found out that the paper clog had cement debris inside... he forgot to take the plug out when he soldered the piped. FFS!!!!!