Water leak inside car, where does it come from?

I have a 1992 Honda Civic. Water leaks inside the car when it rains or when I wash it in the passenger's side, the carpet is drenched. I've had the drains checked and they were clogged with dirt. They were cleaned. But it is still leaking. Where is it coming from? Hope you can give me some ideas before I take it to the garage again! Thanks for your answers! Actually the water comes from underneath the glove box, any other ideas?