Crikey, you lot put me to shame. I don't clean anything in particular before we go away - I do try to leave it all tidy, though. It's more than enough for me to pack, cancel milk (papers are down to OH), water plants, clear out the fridge of anything that's going to go off, stick any bread and milk in the freezer, etc. Oh, and anything in the food waste bin also goes into the freezer rather than fester until the next collection.
If the worst happened while we were both away it would be dds who'd have to sort everything out and they know I'm not exactly Queen of the Duster anyway. I did once worry enough before a long trip to make notes of our affairs (financial not the other!) so that at least they'd have a clue where to start.