Anyone know about weep holes in windows?

[Takket]

I have sliding windows. There are small slits in the track called weeps, so if water form the rain gets in the track it can drain to the outdoors.

Mine seem to be clogged. The tracks just backs up with water in a heavy thunderstorm. I shoved a foot long pipecleaner down the slit, but it doesn't seem to help... but also, the pipecleaner never came out anywhere.... these weeps should have an outdoor exit somewhere where the water comes out, right? The channel seems to run parallel to the window track but I never see the pipecleaner poke outside. Maybe I just need a longer pipecleaner? Where do these weeps usually exit?