Always clean up any spills as soon as they happen.

Before you do your weekly shopping, check your refrigerator for any science projects such as moldy food.

Discard any outdated food or condiments and wipe down the shelves while the refrigerator is low on food.

At least once a year thoroughly clean the refrigerator by taking all the food items out and placing them in a cooler with ice or ice packs to maintain the food at 41°F or below.  Then clean the refrigerator with soapy water including areas like the door seals and door handles.  Then wipe down with clear water.

If you don’t want to use soapy water, some people will use two tablespoons of baking soda to 1 quart of warm water.*

Vacuum the coils in the back.*

Don’t forget to take the drawers out and clean those surfaces as well as the drip pan. Clean drip pan with soap and water at least two times a year.*

Source:  *Penn State - College of Agriculture Sciences Cooperative Extension*