Nothing slows you down like fogged up windows in the car. You may be tempted to simply turn on the defogger and start driving, until it becomes clear that it may take a little more time and effort, ...

Here's the thing, though: cleaning matters more than the spray itself. I picked a Saturday and went through the whole house with Windex first—some of those windows hadn't been touched in a while.

Keeping a few dry teabags in your car can really reduce dampness and help defog the inside of your windscreen.