Any soap that has the words "extreme gloss" is never going to be a "strong" soap,

what about the gloss part? Have to leave room for that, right ?
The only soap from those C/G people that I used for 1st Client visit cleaning prior to paint correction, etc., is C/G Citrus
Wash.. No Wax, No Gloss, No Nothing..
And even with that, I still have to pressure wash first, to get off as much as possible, then wash using hot water, and it does still require scrubbing, and all this does NOT remove Pacific Northwest Tree Sap or Artillery Fungus..
Perhaps, if you do not really care about removing any paint protection, you might consider this --
https://www.autopia-carcare.com/meguiars-super-degreaser.html#.XadqtpKpH3g
I have had to sometimes, pressure wash first to knock some gunk off, get it wet, then spray this product over the worst parts, i.e., inside the gas filler area and inside part of the gas filler door, all the little trees growing inside the top of the roof areas, trunk jambs, hood jambs, etc., then pressure wash it all off again. These areas always came out much cleaner because of the degreaser, and I never hurt anything with it..
Using the big Meguiars bottles, 10:1 ratio = 3.25 oz product, + 32oz water.. 4:1 ratio = 7 oz product, + 28 oz water..
Dan F