Unfortunately, there is nothing that can be done about that overspray short of sanding it off. Car paint is designed to resist all forms of polishes otherwise it would be destroyed every time you had your car detailed. As such nothing I know of will get that out. As for the hard water stains, which cleaner did you use? If you used #2 and that didnt work you can try #4 which is a lot harsher but BE EXTREMELY CAREFUL!!!! This stuff is harsh and it can scratch your paint real bad if you apply to much pressure. The best thing to do is apply a lot of pressure (dont lean on it but push hard) with #2 and if that doesnt work, put a little #4 on the spot then rub the area with an applicator pad or SOFT towel but dont push on it. Only use enough pressure to keep the pad/towel in contact with the spot. If that doesnt work try pushing a little harder but not much. If that doesnt get it out then you have something a bit more han hardwater stains. The other thing you could try though I dont recommend it is to use one of those bathroom glass cleaners that are designed for hard water removal. This might work but I have no idea what the impact to your paint will be. If you want to take this route, apply a little to an area that no one will ever see again (like a piece of scrap metal that you put a bit of touch up paint on) rub it as if it had a stain on it, then wipe it off and rinse it. If after a day or two nothing happens to the paint there then you're probably okay. I'm not making any promises about long term though because I don't know what they put in those cleaners so this is at your own risk. Good luck
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