At the time of my mother's death in 2010, she was still using the washing up bowl that had been part of a gift set she was given as a wedding present in 1954!
It wasn't disgusting at all. In fact, it was made of very groovy heavy-duty plastic that was sort of marbled and had slightly translucent streaks. It was so sturdy, that she used to stand on it if she couldn't quite reach a shelf or something.
How are they minging? I bleach mine once a week, and rinse it out with hot water and washing up liquid every day. If someone leaves scummy brown water in it, they'll do the same in a sink without a bowl.