Please keep in mine I'm the most unmechanical person there ever was. I have a woodvil that I've kept only Mocha Coffee flavor in. Now I'd like to change but the mocha still comes through. How do I go about cleaning the tubes from above the cap and below? Remember, I'm an idiot with all the terms and fixing. If I put alcohol in the drip cup and let it drip or blow it through the tubing, will that remove the flavor?