Must n0t use your windshield washer much.
I remember opening my hood all the time when I first started out. Even changed my own spark plugs back in the day and replaced a fan belt or two. Nowadays, things are typically run to failure.
Another example is with computers. I used to constantly pop the cover off my home computer and mess around with it. Used to install my own memory, expansion cards, hard drives, etc.
It's been at least 15 years since I have had the cover off a computer.