Spray Wash Pre Soak?

I went to a spray wash for the first time in a long time about a month ago. I found a new selection called PreSoak. I thought I would try it.



It comes out with much less pressure and it is bubble gum colored. I like what it does. I use it on my wheels, front grill to loosen dead bugs off and the bottom panels on my car.



Does anybody know what this is?



TIA.
 
I have heard the same as "PAW". Someone once said it was something like a light acid, they used it on Ambulances to clean them, did a good job but hard on the finish.



One thing that I experienced was.... On my old truck I accidentally left one window cracked when I applied the "Pre Soak" I saw it so I shut it before I contained washing, only after some of the "Pre Soak" ran inside the window. After I was done washing the outside I moved on to the inside (20 min later or so). I wiped the inside of the window down and noticed that you could see where the "Pre Soak" ran down inside. The... as I called it "etching" was there till the day I sold it, never was able to remove or lighten it even after a year or two.
 
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