If your kitchen has that "mystery smell," don't buy expensive air fresheners. Don't blame the cat. Get under the sink, disconnect that hose, and brace yourself. It is going to be disgusting. It is going to smell like a zombie’s stomach.

Welcome to the ugly truth of homeownership:

The drain cycle usually lasts only 3-5 minutes. That isn’t enough time to scour a three-foot-long hose. Furthermore, dishwashers recycle water during the main wash. They don’t pull fresh water from the hose; they push dirty water out through the hose.

(Don’t pretend. Go check it right now.)

In short: A clean hose is a health necessity, not just a vanity project. You can call a plumber and pay $150, or you can do this yourself in 20 minutes. Here is the battle plan.