I had the same thing when I first used my rear window washer.After you run it the first couple of times that will stop.

 

Thanks for the help guys. Yeah it comes off easily but was just kinda freaked out too when I saw it. Just the principle of having it pulled around from service like that kinda was crapy in my opinion. They must've used it while doing the service, maybe on their checklist or something.

 

It looks likes GM's Optikleen washer fluid. It comes in 1qt bottles when a dealership preps vehicle off the truck they add this to the washer bottle. It has that destinctive color to it.

 

Wasn't there a recall that had something to do with the rear washer/wiper? Maybe they fixed that while you were in and tested it? Either way you are right, they should have cleaned it before delivery.

 

It loooks like a Smurf peed on your Hummer!

-- Frank

 

LoL