Far as I can tell from reading the regs you can't fish with bait or scent in a selective area, but nowhere does it say you can't be in posession of bait or scent. Hell, if you bonked and cleaned a hatchery hen and were carrying the skeins home you could be arrested if it was illegal to carry bait, so probably they wouldn't bother you unless they caught you with some on your hook.

I have been stopped by an officer on the Hoh before in the selective area, who asked to see what I was using close up. My go to zipper lure for selective areas looks so much like skein eggs that I think he was glassing me and thought I was cheating - I wasn't, and he did comment that the stuff I was using sure did look like bait. He didn't ask me if I was carrying bait, or search me or anything other than look at my license, so I guess it wouldn't have been a problem if I was carrying bait but not using it, although I didn't ask him at the time.

When in doubt, call WDFW and ask to speak to an officer about it.