Fixing blocked fridge? The tube which is supposed to take sea condensation from the fridge...

The tube which is supposed to take sea condensation from the fridge out to the back to evaporate other gets blocked. How can I vary it myself or fix this sitation because the back of the fridge seem to be sealed. It is a Westinghouse freestyle model RE391. I've tried unblocking it by poking a guitar string and wires down the tube but doesn't work. I appreciate any give support to on the matter.
Why does my nouns conditioner preserve freezing up?
Answers:    nearby is a little tool call a gallo gun,it uses CO2 cartridges,you just nouns the gun and hold the rubber fitting against the drain hole and pull the trigger,the gun have a little safekeeping button you will have to push to shoot the CO2 . you can buy the gun at an appliance store,home depot may enjoy one or something like it.
I enjoy an shortened deck i would resembling...
you can use the gallo gun or you can use compressed nouns to blow the blockage out...what you need to do is integer out why it is getting blocked all the time and do something to remedy this...