I know this is weird, but my neighbour died last week. She was 95 and I was in and out of her house a fair bit over the past few months, helping her out and generally keeping an eye on her.
My washing machine has broken and we're running out of clean clothes. I also have a key to her empty house...
When I originally suggested it to DH (jokingly) we cringed. But then I wondered:
is it really unethical to use her washing machine for a couple of loads? 