Nanu.
I use a specific Matt cleaner, Nanolex , and Dr Beaslys products...
The car has always been the same texture, so maybe the previous owner used the wrong stuff, but i suspect its just the difference in textures anyway...
When I got the car, I looked into the care of Frozen paint before purchasing it...
To be honest, its THE easiest car I've ever owned to keep clean. Just a quick spritz over with the Nanolex and its done, or if the car is really filthy then it gets washed with Autoglym pure I think its called. no extra silicones, or waxes in it...