Cleaning out roof vent plumbing

How is the best way to clean out roof vent that seves Kitchen,Tub,Sink?
All are on the same vent and all are very slow. TIA Sam
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Saml wrote:

Usually by going up on the roof and using a garden hose (turned on)
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Joseph Meehan

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Saml wrote:

You can use the same kind of snake that is used to clean your drains. animals can crawl in there and try to nest so that it the type of stuff you find, animal nests and dead critters. You can put a screen over the vent if you have this problem. I own one like this and have used it to clean out vents. You can also rent them.
Link: http://www.mytoolstore.com/milwauke/0567-1.html
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