Yesterday's challenge involved cleaning up your passwords. Today we tackle three potentially germy areas of your home. 1. Your cellphone You take it everywhere. Cellphones can be as dirty as a toilet seat, so wipe it down today (and daily). 2. The remote control Everyone in the house handles it, so wipe it next. 3. The doorknobs And of course, before and after you've touched your devices, you've probably handled your doorknobs. Give them a good clean today. These tasks won't give a room a wow factor, but they may keep you healthy! Tomorrow we'll tackle a job that can make a difference to your every morning. Try 30 tips for the greenest clean ever. (Photo: iStock)