Plumes of thick black smoke when cooking can be a sure fire sign that it's time to clean your oven.
After all, not only is a dirty oven a fire hazard in itself, but the charred and burnt bits of leftover food can tarnish the taste of whatever you're trying to whip up.
And while many of us will spend hours scrubbing away at the appliance, it's easy to forget about the racks which sit inside - which can also become covered in char over time.
