i haven't done a wash & go in like 8 months (whoa), but when i did, i would co wash my hair first. then i would shingle with whatever product i wanted (kccc when i liked it, eventually just a regular gel). i shook my hair often, letting it air dry for 30-45 min. shrinkage would set in during the course of the day, so if i was up to it in the morning, i would hit my roots with the dryer.
note: my hair would turn out differently every time, which is a huge reason why i don't do it anymore. plus, the tangles were a trip.