Definitely Bumblebee canned tuna in oil.  Why Bumblebee?  It is cheap (so am I) and works.  One thing I have found is that I hook a few smolt every year in the bays, and on the Willamette, with the tuna filled.  I think they are chasing it to eat the bits falling out. It makes me sad.  Poor little guys.   

If I do choose to use a scent gel, I apply it to my dropper weight rather than the lure. It is much easier to wipe off the dropper weight than to clean out the lure.  It still creates a scent plume that your lure is constantly going through.