Pro tip: use your phone flashlight to find the rusty bolt, not your eyes
Last weekend my power washer pump started leaking at a job site in Akron. I spent 20 minutes squinting at the underside trying to see where the drip was coming from. Finally I held my phone flashlight at a low angle instead of straight on. That side light caught the shadow trail right to the cracked gasket. Cost me $6 and 15 minutes to fix after that. Anyone else got a trick for spotting stuff that's hiding in plain sight on a machine?