Valet tipping is common in the US and parts of the Middle East, and less common or unnecessary in countries where general tipping culture is lighter.
A small fixed amount when the car is returned to you is typical. Some people also tip a smaller amount when dropping the car off, particularly if it's a busy or difficult parking situation.
Keep a small amount of cash on hand specifically for this, since valet stands rarely offer a card payment option for the tip itself, only for the parking fee.
This varies a lot by country. For specifics on where you are, check the tipping guide by country.
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