How to clean a freezer

[Williams farm]

We have an older upright freezer my wife really likes. I put a killowatt meter on it and it is using four times as much power as the same sized chest freezer we also have, so I am wondering if it needs to be cleaned. The coils are covered in the back so is there a way to get at them to vacume them off? Thank you for all your help.

[How Do I]

Yours doesn't have coils on the bottom? That's where our coils are. They can get pretty dirty from sucking in dust and hair off the floor, especially if you have a pet inside.