I'm wondering what you dilute oyurs to specifically for exterior trim and engine bay? I don't want to end up with 5 different dilutions, I already use it pure for tires and 1:5 for interior. I was wondering what dilutions you would go for for engine bay dressing and exterior trim? CarPro says 1:3 to 1:1, so I rather ask people before having to try it out myself Is 1:1 to shiny for exterior plastics? I assume 1:1 will be more durable than 1:3?