空調下水管堵塞如何疏通?

空調有兩路下水,一路到洗手間,一路到屋簷.屋簷漏水嘩啦嘩啦的,一定是主下水什麽地方不對.

拆開洗手間下麵的管子,黑皮管裏還幹淨,那麽如何疏通上麵連接的PVC呢?

1）liquid plumber? from the vent hole in the main drain

2) compressed air?

3) snake?

Any suggestions?

Thanks,

Here is what Google said:

http://www.dannylipford.com/video/ac-drain-clean-out/#tabs-1

http://frugaldad.com/2008/05/20/diy-project-2-unclogging-an-air-conditioner-drain/

http://answers.yahoo.com/question/index?qid=20080729070028AAxsdnu