Stench by refrigerator / water container
Modern refrigerators have a collecting container for condensation, which usually arises on the inner rear wall. The condensate tank is usually open and is located behind the refrigerator usually directly on the compressor.
If the water does not evaporate fast enough, it starts to rot and produces indefinable stuffiness before eventually spreading a penetranean fecal-like odor. Unfortunately, built-in refrigerators usually need to be completely removed to find this.
But if you have already cleared the entire kitchen and found no mold and dog feces, exclude a pipe break in the wall and the canal works are three streets already completed, it really worthwhile to look behind the fridge ...
