Dont swear at sharpie like that... it's more likely the residual damp left over from washing the bike has pick up some dirt while wheeling it from the drive way back into the garage 😂
WASHING
. I don't even put water on it - damp cloth at most.
On some of my DRY country rides I sometimes come across a section where the previous days rain has run off the fields and across the road. I usually only see it at the last min - otherwise I would turn round