It is almost certainly spider mites. I would not recommend spraying them with just anything. To eradicate mites, you need a miticide, however your flowering girls are too far into flowering to spray them with anything that would do any good (IMO). Cold water showers can rinse a bunch of them off and take some of the eggs. However, unfortunately, at this point you are kind of SOL with your flowering girls on being able to do anything against mites chemically. I would recommend getting either Forbid or Floramite (check E-Bay these are controlled miticides) for your vegging girls. I would further recommend staying away from things that do not work,m like Dr. Doom, neem oil, pepper sprays, etc, etc. Mites build up a tolerance to pesticides very quickly. Get serious and get rid of them.