Yeah thats well known in the lifetime of the Messenger of Allaah sal Allaahu alayhi waSalam ^ he would talk to people on the streets, and because he had good manners - he would recite Qur'an to them, they would become muslim straight up lol.

So maybe you could use points from Qur'an to make people think.. and remember to have good manners! Most people want friends, but they feel its a harsh world.. so by being good, they'll want to be your friend and therefore you can encourage them in their dawah also.