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I know how to fix the technicolor issue,
first use meg plastX (plastic cleaner) to clean then wax it with a couple of layers of a hard wax, I use zymol concours but it doesn't have to be that fancy, collonite or another will probably work as well.
finally, always hand wash the car, I have found it does the technicolor effect only when going through touchless car washes, probably due to the harsh cleaners used.
let me know how it works out
cheers
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