Originally Posted by 150ron
Any form of mechanical work on a vehicle, be it a bicycle, motorcycle, car or even a lawnmower.
"What did you do at the weekend?"
"I spent all weekend in the garage spannering, got the car running again by Sunday"
Had to look that one up.
Learning something new...
The original comment was tongue in cheek, but it was the first thing that struck me when I saw the photos of your exhaust swap. While about the only risk there was introducing dirt into the header and exhaust fasteners, it is something that is best avoided.
The second was parking a dirty bike in a clean workshop.
The pressure wash is fine if you're thinking about where you're pointing it.