Magno Paint and Hard-water spotting




I tried rewashing - with little effect. I also tried windex which did nothing. I know I cannot do any buffing or polish.
Any suggestions? I saw in another thread somebody mentioned CLR "Lime Away". I considered that but was worried about harming the finish even more.
I ceramic coated my car, but that was last summer. It has undoubtedly worn off by now.
What ever you use, i would test a spot that is not very visible and see for any after effects besides the lime scale removal.






