307sw ceiling tile cleaning / replacement ???

Hello to everyone. As you know, I sold my LPG vehicle and bought a diesel 307 sw.
I want to have the vehicle thoroughly cleaned, but I am afraid the ceiling will sag. auto hairdressers did not give any guarantees, they said sagging can ultimately 8 years of vehicle.

If the floor sags, can you give an expert flooring advice that can replace all ceiling tiles, including the electric ceiling curtain that opens 307 swns in Muğla and its surroundings (Denizli, Aydın, İzmir)? it is likely to have to remove the entire ceiling and curtain assembly. If they have it before, they know, how much is the estimated amount?

If the ceiling cleaning is a competent person with a bit of trouble, but I don't think there will be sagging. Difficult to find dealing with ceiling tiles

Unfortunately in Istanbul I know

Definitely sag, my 206ya 250-300 TL they said to the complete ceiling tile

In some places, tiny air bubbles have already appeared. I doubt it even if it behaves kindly on the ceiling with foam. I thought if I should change it directly instead of cleaning. I will now try to find the nearest sea ...