This is pics of the same car and the same wash I uploaded before. So before pic 1 and foam pic 2 and after foam clean rinsed pic 3 and the 4th pic after tar degreaser and before touching the paint.
You can see the rust and paint chips a little bit over and to each side of the number plate. And the wiper end turns where the window fluid runs down. Even at the lowest edge of the trunk lid is a rust line. This happens before the car was 4 years old. And since I have started to take care of the last year it`s stopped spreading slower I think.
Here I try to translate from the sds document of a touchless wash that is available to the consumer in Sweden. And what I have seen so far on swedish forums it`s impresive. We can accually get wash chemicals that is used in car brush washes and touchless car washes. I think those is even to strong for me to use LOL. And I think you have noticed that I use more chemicals when washing than you are used to see. But as I have said before it`s a common way to prewash like this here. And if you want to test it out. Get a citrus based degreaser like Angelwax Cleanliness and a tar remover and either wash after or foam a car soap on and rinse. The best results you get with a pressure wash.
But you can go to a coin op and have pressure spray bottles or and spray bottles with chemicals ready to use. If you do it this way start with apply the tar remover first. Apply it to the side and back of the car and from the bottom up to a bit before where the windows begins. And when it has dwelled after recommended time from the manufacture and you don`t let it dry. You apply the citrus degreaser over it and to the whole car and let that dwell as recommended. Then PW it of with start from the bottom and work your way up and use the water pressure from the PW as it`s your wash mitt. Rinse the car well after this to get it of. Do your wheels if needed to if the citrus degreaser didn`t cleaned it. The tar degreaser you can use on the wheels if needed. But not in the wheel wells!
Now you finish with apply the the car soap and let it dwell for a couple of minutes and rinse it of. Start your engine and drive off

And if you have a good sheeting lsp the water rolls of. Or if you have a cordless leafblower to dry it. Not touching the paint with a drying towel as it`s not clean enough. If possible and if you want to rinseless or waterless wash it at the coin op or when you come home.
Chemicals in the prewash and touchless wash from the product Mafra Mangusta. It`s a Italy based company.
From the msds
Etidronic acid <5%
Ethoxy alcohol <5%
EDTA <5%
Sodium hydroxide <5%
Nitrilotriacetic acid <5%
2-Butoxyethanol <2%
Potassium hydroxide <2%
When used in the foamcannon the dilution is about 1:9 and max chemical from it. From a spray bottle a dilution about 1:50. You can only buy it in 5 gallon size. There is some harsh chemicals in that lol
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