In Argentina, although many people use the methods mentioned above, the traditional thing to do is to place an empty can or plastic bottle (filled with water so that it doesn’t fly away) on the roof of your car while it’s parked.
In the past, people used to ring the bell of the house the car was directly parked in front of. Nowadays, car owners place a piece of paper with the car model, mileage, price and contact information. If someone is interested, they’ll try to contact the owner in order to start negotiations.
Do you have a similar custom in your country?
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