WD40 used to be great.....the new formula this day and age is no good. They no longer use a fish oil anymore. So unless you stalked up and have cans that are atleast 8-10 years old your probally not helping. That's what my uncle says anyways he used to spray his lure with WD40 and I asked him a couple years ago why he doesn't anymore. Steelhead fishing for me I think the fish like my borax in my spawn more then they like the eggs. I've also seen a episode of river monsters or something where they we're using pieces of unscented bar soap on a hook for bait. Anything that gives off a strong different smell could trigger a fish