How do I replace rear windshield washer tube from from of car to rear of car on my 2006 Dodge Caravan?

Before you go replacing the tube i would see if the rear nozzle is clogged.I would say most likely you have a clogged nozzle if the washer pump is squirting fluiding of of it.

How do I unclogg the tube?

Iam talking about the nozzle where fluid squirts out on the back window.

oh ok, i have taken the nozzle off and it still dosen't work. I've even blew air in it with an air compressor and it still dosent work. Probly my best bet is to replace the whole tube. How do I take it out and put a new hose in?

Are you asking how to replace the whole hose that runs from the rear washer nozzle to the washer pump?

yes, I've been having troubles, with it.

I dont have the step by step instructions on how to replace the hose.You could try a little trick i have used in the past.Tape the new hose to the old hose and use the old hose to pull the new hose into place.