They can mess with the cleaning additives like citrus and lemon has a effect on alkaline products if I remember correct they will fight each other's reaction and not fight the grime on the car. Quest can help you a lot Jason the president will guide you in the right direction. I know this in my experience that blue coral , rain-x and Armorall and turtle wax that I have used in the past 3 years don't smell half as good as quest especially on there color polishes and waxes, Protectants. Just my personal experience what ever it's worth to you.