Our airstream has been planted in our driveway for going on 5 months now, becoming one with the island winter...literally. It has been growing moss and other green things on it and probably has been for the many years it was parked in someone else's driveway before we owned it. So a sunny day got me out scrubbing (while J was busy patching the belly pan)! Very satisfyingly, the nastiness came off with simple soap and warm water. And now when our neighbors drive by they won't cringe at a green-tinted airstream!
Ahhh, no more gross airstream ecosystem
And as my reward, a sunny walk in False Bay with the puppies.