Towards the end of 2020 ι was hearing a strange noise from the roof light and only when the car was turning, an annoying ''tzzzz" but not when it was rolling in a straight line. I waited a few days and at the beginning of 2021 i went to the repair-shop. I asked them to remove the Headlining (here we call it inner roof) for inspection and on the occasion, i told them to soundproof the roof of the car. That ''squeaky'' sponge was removed permanently, the inner roof was cleaned thoroughly and as you can there are 3 small holes, the 2 of them was from a bottle of beer that a neighbour throw out from his balcony towards the trash-can on the road (but landed in my car which was beside) and the other from a juvenile which hit my roof as a sign of ''resistance'' because i had a Greek flag sticker in the trunk door. According to his religion the neighbour should drinking because he could face a fine and public whipping in his country but here is Greece and the local's people assets don't count. I didn't had the time and money to fix those holes plus the painting job so i let them for another time. The sponge that has been removed from his position a bit and the harness of the ceiling light was causing that sound. As for the soundproof project first i bought some sheets of STP Black Silver Shop Pack, according to the manufacturer: It is installed in any area of the car where vibration attenuation is required: external and intermediate door panels, roof, floor, engine compartment, trunk, etc. The ceiling was ''naked'' from inside and for sure there were some vibrations because there was to support except one bracket in the middle and second i bought a cheaper material in roll form to absorb the sound.