Only bike i did leave a bit dirty was a G5 Matchless i had to ride to work every day in all weathers. A 55 pound buy and already in a poor state so just got brush painted with gloss paint. It finally broke down in a notorious Council Estate. Just an electrical failure and i had to leave it overnight. Next day, i returned to find the locals had thrown rocks at it so sold for spares at 10 pound then bought a brand new CZ175 as i really needed the reliability each Morning.
Oddest thing with a CZ is it could start and run backwards. Funny experience trying to pull away and it is reversing. Lovely little trouble free bike. I wanted a Honda CB200 but just not enough money to buy a new one.