The Model3 has a dedicated button for the windscreen wiper on the steering wheel, and then you can adjust with the scroll buttons. It certainly has a learning curve, and it would be better if you could rely on muscle memory for these things.

I usually spend a couple of minutes when I drive someone else's car to get familiar with the controls, as the rear window windscreen wiper, light controls (especially fog light) can be tricky on old cars as well.