u/CornOnThe0rb

I’ve got a 30 year old Hilux I just bought at the beginning of the month. Since it rained, it has hard water spots on the sides of the car (nothing on hood or roof) that only come off when buffed. Last week when it rained, I buffed and waxed it and they came off. I had to put some elbow into it though. Rained a few days later and the spots are back. Is this an issue with my clear? How do I keep it from happening again? TIA. Located in Raleigh, NC in case anyone is curious about location for water