The idea that when you mix 2 chemicals together it becomes ‘illegal’ as it produces a 3rd chemical of which you cannot produce a specific MSDS sheet for is incorrect. the cleaning industry is full of different additives that can be added to routine cleaning chemicals to produce specific results, you don’t have a separate data sheet for this mixture but it is not ‘illegal’ to use
D’lemonine can be added to help emulsify oils, enzymes can be added to break down organic matter, I think the biggest additive is odour conteranctants that help cleaning agents deal with problem odours.
I’m no legal expert but if you use chemicals in accordance with the manufacturers instructions then any legal implications is on them including using recommended additives