Do not pay these kids who crawl on your car without your permission. If the local drunk washes the windows-10 pesos is what you SHOULD pay but 20pesos is what he will ask. Do NOT give him more!
Unique Suggestions: When you are parking and do not want your car washed-look the man or kid in the eyes and say Please do not touch my car.
OK they are fun and they are charming and they seranade you at your dinner table whether you want them to or not. But then they put their hand out and demand a tip. We had just arrived and I only had the equivilent of about $2 in pesos so I gave it to him. HA, he was insulted and very rude to me because the expected tip was something like $5. Hey I didn't ask him to play, kinda made me angry, his attitude.
Fun Alternatives: Shoo them away from the table unless you are willing to pay them $5 for 2 songs.