The new Shamway Store is a great POI but doing a Clear Quest in there is frustrating.
There are some zombies that don't seem to react to anything at all. I can make as much noise as I want, they won't come out of their hiding place. I spent half a day searching for the last three zombies.
Two were hiding in the false ceiling and a crawler was hiding inside a machine surrounded by an iron fence. If I hadn't found the crawler by accident I would never have found him because he didn't even move when I stood 2m in front of the machine and he wasn't visible on the compass.
Only after I killed the crawler did the other two appear as yellow dots on the compass.