I was actually told about this by a member just recently (statusdetailing) & experienced it myself over the weekend.
Was this on smooth plastic or textured vinyl/plastic?
I just bought a very cheap ute for a workhorse & it was FILTHY! Ex tradesmans car & EVERYTHING was sticky & dirty.
I cleaned everything up with Megs APC (regular green) @ 10:1 & 4:1 where needed.
I noticed, as you have that I had a slight, white discolouration, for me it was on the textured plastic centre-console, etc... Did not affect the vinyl or smooth black plastic.
I knew using it at the strength I did was a bit of a risk but this thing was a nightmare, I was in a rush & just needed it clean quickly & easily. I also figured with this car I can cause some (slight) damage & work out how to remedy it. Good experience & better on my car (this one anyway) than someone elses...
Not my usual attitude I promise!
Anyway I went around afterwards with some 303 Aerospace Protectant & you would never know what had happened...
Time will tell if the AP is just masking the problem but for now I am happy...
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