windshield washer fluid light won't turn off

[23RAM]

You could be like me and fill the coolant reservoir with washer fluid…

Oh that sucks...but I can see it happening.
The two caps should be different colours. Perhaps bright red for the coolant and yellow for washer fluid. This is the first vehicle I've owned where the coolant was right up front which makes it slightly easier to fill, but also slightly easier to screw up.

 

[23RAM]

Use Aquapel. It's semi-permanent. Do it once a year or so. RainX kinda sucks for streaking and haziness. Aquapel just needs you to really really clean the glass good and then apply it when it's cool, not mid day hot. After that it'll beat rainx and lasts practically forever. I don't even need wipers 99% of the time.

I'll have to see if I can find that here.
In Canada Rain-X no longer repels water. It's made by another company now and the water repellent ability is about 99% less. We stopped using it.