I've had a blue dot on my khaki shorts a few times after loading/unloading gear in the back. I figured out it's a liquid coming from a small black nozzle next to the rear camera under the spare tire. I know I have headlight washer nozzles but is this really a rear camera washer?

 

Yep, there's a little nub that sprays water to clear the rear camera. Not sure how effective it is, but it's there!

 

Something else to break that all.