interesting that you bring this topic up. This will not help with your question (for that i'm sorry I dont have any input), but here is my take on it.
I have a 03 jeep grand cherokee that I bought from the company I work for. Before I owned it, my father did.
This vehicle has never seen a single interior product in its lifetime. And lived outdoors in the sun its entire life. Has never seen shade on purpose or a garage. I gave the interior a full detail last spring , and trust me it was dirty.
I basically used a light mixture of APC on the entire interior and it came out spotless. and there was ZERO visual degradation to the dashboard or any interior vinyl/plastic pieces.
After this experience I really began to question the need for UV interior dressings on modern cars. Ive come to the conclusion that modern chemistry and manufacturing have really come a long way. And most "quality" cars are very resistant to the harsh conditions that can be thrown at them.
Since I have really began to not worry so much about protecting the interior of my cars as much as I used to. And now I use more and more 1 step products for leather and plastic as well. Instead of dedicated conditioners and cleaners.
I liked the sonax dashboard cleaner very much though.

I have found megs quick interior detailer a bit easier to use on a wider range or surfaces.
sorry for steering off the specific topic mark. lol