Nasty

Ok. so I knew there was something gross making these iridescent trails all over my garage but I was able to kind of ignore what was going on down there. to my complete horror I came upon this yesterday morning....

 it was like 5 inches long....

Repulsive.  I think they are coming up from this large drain/ sump pump thing in the center of the garage.

Going to have to outline the drain with copper tape, and possibly bring out the Sluggo.