My house was built in 40s and the plumbing can be a pain sometimes specially in the bathroom sink and tub. My wife, daughter, and one boy have long hair which is generally the root of the problem (ha ha get it "root"). I found the cheapest preventative maintenance item is a drain screen that sits in the drain and catches the hair. Now getting them to dump the screen in the trash, I can't help there!
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"Don't let fatigue make a coward of you."