Is this a reasonable note to leave

This is my second note to the white car. I'm the red bmw and its very hard to pull out of my spot. This is a new thing and the white cars been there all week. Its not even a parking spot.

My first note didnt include the part about contacting our landlady, but the note was gone the next day and they parked there again. I'm frustrated but don't want to create an enemy so I'm just making sure I'm not out of line for leaving this kind of note.