How much should you tip people who hand wash your entire car?

Generally speaking, a tip is a gratuity, something you do not owe because you paid a fee for the service. Assuming you were charged a fixed amount for the car wash, the tip should be about 15% of the amount you paid if you are satisfied with the job they did. You may want to tip 20% if you feel they did an excellant job or nothing if they did a lousy job. It's just like tipping in a restaurant. So if you paid $20 for the car wash, you would tip about $3, if you paid $10, the tip would be $1.50.How much should you tip people who hand wash your entire car?
I guess it depends on how much it cost you. I think a general rule of thumb is $5-10.How much should you tip people who hand wash your entire car?
If they dty it as well, probably 5 bucks.