I just cleaned my Gyres for the first time in a year It's like they are brand new power heads. Seriously there is so much more flow now.
I need to do the return and skimmer next. Probably will do one at a time. Vinegar soak and scrub.
You can use a magic eraser (original unscented) to help scrub in between deep cleans and glass scrapping.
If you are dosing, it is a good idea to calibrate the pumps every so often. Depends on what doser you are using on how often you should calibrate. I do my GHL Doser 2 every six months or so, an everytime it is still spot on. GHL FTW!