disconnect 98 ML rear window washer line

[supradupe]

Does anyone know how to disconnect the rear window washer line? My 98 ML tailgate (near the door lach) was rusting and my dealer replaced the whole door (yes, I got a brand spanking new door with new paint after 5 years). I just realized that the culprit of this rusting was probably due to the leaky washer line that goes into the rear window washer jet. I don't want to pay the dear to replace it, since I don't use that washer I want to just disconnect it from the washer reservoir so that it won't leak and rust my new tailgate again.
Any thoughts?

p.s.: I found that there are two pump attached to the washer reservoir mounted under the hood, which one should I disconnect, and is there any consequence if I disconnect it?

Thanks
steve