Some folks add "Tween" or Photo-flo to their sensitizer to facilitate even coating on stubborn papers.
If you look closely, you will likely observe a faint cloudiness in the first wash water; the silver nitrate combines with chlorine in the water producing a insoluble silver chloride (assuming your water is chlorinated). Although there are no spectacular indications that unwanted salts are being removed, be assured that they are!
Good luck, and enjoy your prints. VDB is a beautiful process.