Was reading another site that suggested ash residue might be an issue with grapes still being harvested out of Ca after the fires. In this case rinsing might have some benefits.
Two years ago we had really bad smoke at Chelan for most of the fall one winery I know of washed their grapes. The choice was watered down must or smoke taint. I’ve heard mixed comments on if grapes in Napa were already in the wineries. I hope so.