You wave at the front of the house as soon as you step out of the car.
Alot of people, will peep our their blinds to see who just slammed their door.
If they see you waving, it gives them the impression that you've seen them (even if you havent) so they are more likely to answer the door.
I was trained to do this when I was selling face to face, I did it, Im not sure if it worked or not, and if I was still selling face to face, Id still do it.
Its not going to stop people from answering the door.
That's pretty much it, but when you describe it this simply, for some odd reason they think you're telling them to stand out front and just keep waving and waving and looking like Gomer Pyle or something. Totally wrong. It's just one simple wave and done. Not a big deal.
Had a lady tell me once that she didn't know who I was but when I waved she figured she must know me somehow. I never saw her looking out, but she sure saw me!