As per Steve, the maximum recommended dillution is 4:1. My primary use for this is on tires and engine compartments. What I like about this is that even when the gloss does fade, it does not make the tires look brown, nor does it havea greasy look on rubber on the hoses and other things. It can also clean tires and rubber, but i prefer to use it as a last step product. For interiors, I stick to either Natural Look and/ or woolite.
Once you've applied it a few times, you can get away with hitting the areas again with a dillution later on, and still keep things looking good.