I know this is not unreasonable of them, but we (in theory) exchange this week and complete in two weeks and the house is in absolute uproar.
There is stuff everywhere, cleaning schedule has gone to pot, we've had to leave weeding the garden paths, clearing leaves, etc, until a few days before the move so even the garden is currently looking scruffy.
If we refuse, with a likely sounding excuse, I'm worried they'll hold back exchange. If we agree, I'm worried they'll think what the hell are we buying and either pull out or demand a price reduction for some reason.
Tell me I'm not alone and your 'I had this and it was fine' stories.