How much do people typically tip?

I tip $3.00 on a regular wash. On the deluxe one I have tipped $10.00

That probably depends on the person. I would say somewhere around 20% just like you would a waitress. Keep in mind though, with those places it's normally a community tip where they split it amongst themselves.

$1 or $2

I normally tip when it's done, make sure they did good. It will depend on the job. But it's usually 20%.

Same $3-5

Usually $3-5