Ok, I'm new here so be kind

Also, I did a search on this and couldn't come up with much, so I'm asking here.
I'm looking for a great shampoo that deep-cleans and won't harm the finish. I just bought an 8-oz. bottle of
Sonus Car Shampoo, but I'm not going to use it yet because my car is dirtier than usual. There's a little bit of tar on the car and I've heard that the Sonus stuff is for cars that are fairly clean to begin with. I need something that will deep-clean and get the car ready to
clay because that's what I'm planning on doing this weekend if the weather permits. Thanks guys/gals!
-Brodie