@balabob I've used the 90-90 passive alignement in the past to get rid of a "chronic" lower back pain (due mostly to my abolutely-not-ergonomic-sitting position at work) and the feeling of opening in my lombar/hips area was just awesome.
I'm still using from time to time juste to feel that...
@faith2 Clean before each press, clean 1 time before the set of squat
If you don't clean every time (before the press), it's not a clean and press anymore, but it becomes just a press.