Thanks. I know people used to believe the WD40 would cause deterioration of the O-rings in the chain, but apparently, it is mostly naptha ... which is similar to kerosene ... which is known to be a good chain cleaner (and is even recommended in some owner's manuals).
I apparently cannot post a link, but there is a YouTube video with the following title discusses this:
Will WD-40 Destroy Your Motorcycle Chain O-Rings? | MC GARAGE
However, this video points out that WD40 is a degreaser, not actually a lubricant. It is supposedly good at cleaning the chain, but then you are supposedly to apply some other kind of chain lubricant...