Moldy car water damage

hi, I beleive I have a clogged drain in the roof of my car or a missing drain. I opened the moon roof and stuck a thick pipe cleaner in a whole the only one i saw and it popped through into the interior roof so i assumed the water is leeking into the car from the same place. It does not seem to be coming directly from the moon roof. I have brought it to auto machanics and autobody shops but so far no one wants to take the job. they say come back tomorrow or iam not sure or i cant guarantee anything. any of your kind help would be much apprietiated thank you.