I did a search on this topic and I found an interesting solution to the problem of roof leakage. Using a cloth hanger, much like the way one would use it to unclog the kitchen sink, to unclog the drain hoses located under the sunroof. Doing this has proven to be a much difficult task, especially when dealing with the back drains. I’ve been considering using DRANO or some other home liquid plumber to unclog the drains... and risk paint damage... maybe structural damage... How exactly can I unclog the rear drains? I can’t even get there with the hanger.

 

I don't know if this will work but I had this done on a air conditioning drain tube in my house that was clogged and it worked...... The guy used a can of compressed air with a tube, he put the tube from the can in the AC tube and it blew everything out. Maybe worth a shot.....of course finding compressed air like this may be difficult...

 

Im having the same problem. I cant get to the drain hose. I see the end of the hose behind my back wheel but I cant even see it let alone get to it through the sunroof.

 

radioshack sells air in cans.

 

Yeah, compress air will definitely do it. I am not sure if the can ones will be enough though, it depends. When mine was clogged I used the air from my friends air tools (he has a performance shop). I poured some water in each of them and then my friend flushed them out with the airgun. fyi- the water was to see when we got the stuff out.