Headlamp washer tubing

[Doodle]

Does anyone know how this routes? I'm specifically interested in the location of the union, where the single line from the bottle meets the runner that feeds both headlamps.

It appears that the garage who worked on it last week couldn't be bothered to refit it properly, first squirt with the lights on and the bottle has emptied its contents into the undertray.

I'm hoping I can get it without removing the entire front bumper, although I know I'll have to do that eventually to put right everything else they screwed up