Is there a general rule of thumb on who you are supposed to tip?

Eraserhead asked:


I know you tip Taxi drivers, waiters and hairdressers. But last week I had my carpet cleaned by a company and I had no idea if I should tip the cleaner or not. Then I got my dog groomed and didn’t know whether to tip the groomer. How do you know? And should I have tipped these people?

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