So I got caught in the last week and ended up with these horrible water marks that are pretty stubborn to remove. I’ve had luck using carnauba cleaning wax in the past, but this time they’re not coming off. Is the next step a random orbital polisher?

Thanks,
Simon

Caught in the what? Rain?
Spots form due to minerals in the water.
I've used vinegar to remove hard water spots.

Oh man, yes the rain. Sorry about the typo. Thanks, I’ll try the vinegar.

Do they came back with time?
The reason I am asking is that mine has done that since new.
I will wax the car and the finish looks great, within several months the water like spots re-appear.
I am under the understanding the it was a problem with the primer during manufacture.
When I bought mine in 85 the dealer told me this. They were supposed to fix the situation but that never happened.
What color is yours?
Keith

Been dealing with water spots lately. I will try that vinegar trick.

Vinegar worked for me

I’ve had great success with Clay bar.
If used as directed it removes the fine particles with no damage to the paint.

Vinegar always works. Let me know how did it go in your car.