Let me tell you about Bob from West Orange. Last Sunday, he decided his slow bathroom drain needed “the works.” First came the boiling water. Then the baking soda and vinegar volcano experiment. When that failed, he dumped in enough chemical drain cleaner to dissolve a small car. Twenty minutes later, I’m at his house staring at what used to be a perfectly good PVC pipe, now resembling modern art. “I thought more would work…