Took me 12 years to realize I was cleaning sensor contacts wrong the whole time
Honestly, back in 2011 I started doing my own sensor cleanings on a Canon 5D Mark II. I always used a dry swab first, then a wet one, thinking that was the standard. Last month I was at a workshop in Chicago and this retired Nikon tech watched me do one. He just shook his head and said "you're dragging the dirt across the pins, not lifting it." He showed me the trick of using a blower before any swab, and then doing one pass only, never back and forth. All those years I probably scratched a few boards on customer cameras without knowing it. Has anyone else had a "wait, that's not how you do it" moment that came way too late in your career?