The best thing you can do is wash the car again and then use some good wax. I use only Meguiar's products. First, I use the Deep Crystal steps one and two - cleaner and polish and then Gold Class wax. I have 2 black cars so I wax minimum twice per month. You can try to use a quick detail spray but I find if you have hard water spots then you need to wax the car first. Then after every wash you should use the detail spray. It helps keep the finish smooth so you don't have this problem again.
You should also get a car duster. It will help you keep your car clean in between washes.
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