I would give an example. Since I have not seen any Adam's MSDS, I do not know if this is used in any products,
I know some people are sensitive about using products that contain
Ethylene Glycol Monobutyl Ether (2-Butoxyethanol). It is used in some products like glass cleaners (know two detailing brands that use it) and other common household cleaners.
It is not considered really especially toxic but there supposedly workplace limits and has caused cancer in laboratory rats that were given 6 zillion gallons. Therefore, some are concerned about it since if you happen to use in confined areas you exceed maximum safe dosages. They would propose you use vinegar, etc, as a natural substitute. If I was detailing inside of cars for extended periods, I may think twice about it.