Only going to admit anything here so I can answer Davros..
I do defrost my freezer but am ashamed at the rest of the list - dd came into our room the other day and said 'mummy it smells disgusting in here, has daddy farted ?' 'Must have' I replied before ripping off the bedding and sticking it on a hot wash, having worked out it was about 6 weeks since it last was changed...
To defrost freezer: take everything out that isn't iced-in and bung it in the fridge or cool box or wrap in newspaper.
Unplug freezer
Put a roasting tin full of boiling water on the top shelf and push the door almost shut. After about 10 minutes refill the tray and grab a spatula and start laying into the ice. If you put a towel on the bottom shelf it helps. After around half an hour you will have a wet, ice-free freezer. Dry it off (otherwise ice will form straight away) and plug back in, switch to fast freeze and put stuff back in.
PS I ALWAYS clean the loo before anyone visits (and at least weekly as well) and change the spare bed regularly, it's just ours that seems to get missed.. Oven gets cleaned once the smoke alarm goes off.