Whiteflies..5 weeks into flowering... +Rep!

So my girls are about 5 weeks into Flowering and I have noticed white flies and eggs under some of the leafs.. I have Neem Oil and read up the FAQs under https://www.rollitup.org/view.php?pg=faq&cmd=article&id=346 - was just wondering at the bottom where it notes to do a follow up spray of water.. does this mean directly after the application, a few hours, or after the 2 weeks of ending the their life-cycle. Anybody who has used this technique before and could reassure me on the process so I do not kill my girls.

I will gladly give Rep to those who can give helpful responses.

sorry wrong thread

i had that problem,i sprayed the soil,it pretty much took care of them,and i also left a bucket of water around,it normally got a good deal of them,i believe they lay eggs in your pot soil so spraying it took care of it for me....