leaking fluid

[Va2500HD]

I had my heart stop for a second last night when I walked in the garage. I happened to take a glance under my truck and saw a nice size puddle directly under the oil pan. I got on the floor and saw fluid had traveled on the floor from the area near the left front tire. Further inspection confirmed it was not oil but rather window cleaning fluid. I found the resovoir between the bumper and wheel well but no obvious source for the leak. My question, before I maybe try to pull things apart, is if anybody knows of any common issues with this problem? Any ideas?

[GM-Tech]

Seen mostly pumps leaking. It's possible the tank itself is leaking, but that's not as common.