Cleaned my S2000 in a rain storm at 11.30pm one night. I found bird cr*p on the car when i left off work and did not want to leave it on there.
Gave it a quick rinse but left the rain water to do most of the work.
I was soaked through to the skin and very cold.
She did look good the next day though and no water marks at all on the paintwork.
My other half thought i was completely mad, well whats new Hun!!!