I've tried "everything" in order to clean the interior of my cab. Some detergents had nasty symbols on the bottle
The best by far so far... is old fashioned soft soap made from pine oil or tall oil.
I've used the liquid type (think double cream) and simply smear it on with a rag and leave it for 15-20 minutes.
Clean off with rag and water

Very good in the faux leather? grooves of the plastic.
Worked a treat on all the black stuff left on head lining, red handles, and plastic panels. 15 yrs in London leaves a mark
Treated the plastic panels with a non-glossy, silicone free, interior shine product (name?)
My next head ache is how to fix the sagging headliner in the drivers compartment
All the BEST!
/M
_________________
P-reg with STT Emtec Clean Cab System
