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Jersey Bill

Cleaning plastic exterior walls

Question

I have a car wash to clean. The exterior is a lot of glass windows and gray plastic walls.  The exterior walls look like painted aluminum but after a closer look and some tapping I found out they are plastic. The car wash has been there for over 8 years. So I know they can hold up to some abuse but I am concerned about my mix, SH and liquid laundry detergent.  The manager said the place was power washed last year by another company. I have no idea what they used or why they didn't hire them again.  I was going to use a light mix of SH and dawn.  I have read some posts recommending apple blossom Dawn for windows. So I was going to use that for my mix.  If anyone has some suggestions for the plastic walls I would greatly appreciate it. Unfortunately I do not have any pictures.

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