Use Rainex on Model 3 windshield?

According to Model 3 owner’s manual, “Do not use windshield treatment fluids. Doing so can interfere with wiper friction and cause a chattering sound.” I am having my car ceramic coated which includes 2 layers of “Rain” on the windshield. Wondering if I should decline this service?

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Use Rainex on Model 3 windshield?

I applied Rain-X to my cameras. This is what the windshield looks like post car wash. : r/TeslaLounge