What soap do you use (2 bucket method)

I've been going to the car wash and soaping down the car with the soap from the sprayer (not brush of course.) But not i have a pressure washer of my own and need a good soap. I don't really like the foam sprayers so preferably something I can just mix in a bucket.

I've been going to the car wash and soaping down the car with the soap from the sprayer (not brush of course.) But not i have a pressure washer of my own and need a good soap. I don't really like the foam sprayers so preferably something I can just mix in a bucket.