I used to like Wilko for cleaning and home supplies but rarely bother going in now as the shelves are usually empty. I don’t find them to be particularly cheap either. They’re usually all located in town centres which are increasingly difficult to get to, I presume most people prefer the convenience and selection at the likes of the range, B&M etc.
Another sad story for the high street but councils insist on making it so difficult to shop there! In the town where I live parking is expensive, bus services are non existent, trains are always on strike, roadworks everywhere make it hard to navigate. With fewer shops open it barely seems worth the hassle. I’m not surprised people favour retail parks.