Completely drain Florakleen/Nutes in AeroFlo?

I have an Aerflo2, I'm going into blooms stage and my plants are very tall, they do not like to be moved very much because I filled 32 out of the 36 spots and they are weak, my question is... because of the design of the Aeroflo2, can I simply dilute the nutes / Florakleen left at the bottom of the resivoir that does not drain due to gravity. Do I even need to dilute them? What is the effect of little nutes left in with the FloraKleen, What is the effect of FloraKleen on nutes during the cycle, say maybe 3-4 gallons in a 40 gallon reservoir, will that hurt them in anyway?

I need to know soon if I should try and do this or just risk taking off the grow chambers and just completely drain and clean the thing as GH recommends, I can't imagine people would do this every week.