Head lining

Hiya guys I am borrowing a friend's bissle carpet cleaner next week (hoping for some ok weather) I'm pulling the seats out doing the whole carpet and the seats. Just wondering though how do I clean the head lining? I don't want to use the carpet cleaner on it if it's going to go saggy it's a cream lining so not sure what the best stuff to use would be.
the head linings are made from a cardboard/fibre composite material. not the old type with cloth stuck on the moulding.
they do come out quite easy through the back if you have a hatch back?