Lime/calcium blotches on car?

Try clr. You can always dilute.

Apply clr to a microfiber towel, lightly dab onto the affected area, don't push and smear, just dab it on. Let set but don't dry, then rinse. Repeat. If nothing works, slight agitation then compount. Looks like etching maybe
 
Yeah, I dunno, I'm not saying I'd dismiss CLR out of hand, I'd just rather use something that is designed for automotive use before I did that, like Finish Kare Decon Step 1, Valugard ABC step B, Optimum MDR, CarPro Spotless, or the Duragloss water spot remover.
 
Well true I agree. I'd always prefer automotive specific stuff because the sense of security with it. But in the end, every is just chemicals that combat other chemicals or stuff like that
 
asianisafish said:
But in the end, every is just chemicals that combat other chemicals or stuff like that
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Absolutely, you just don't want something in there that's fine on your ceramic bathtub, but not for your paint. Not to mention if you get it on some trim, etc. There's all kind of warnings on CLR about not getting it on metal, which is kind of silly when you're going to use it in your shower (maybe on your showerhead, faucet handles, spout) and wash it down your metal drain.
 
A little change in direction to the post. I'll probably not use the CLR and will stick with various solutions of vinegar. I have a bunch of stuff packed for this little detailing venture...just in case . I'll be using a pc and have packed 5 1/2 inch and 4 inch Lake Country flat pads, the new 5 inch thin Megs pads and Megs 5 inch and 3 inch microfiber cutting and finishing discs. The products I'll have with are Megs Ultimate Polish and Compound, Megs DA 300 Correction Compound and good old Megs ColorX to finish the job. I will also have both mild and aggressive clay. I think that I am ready. I feel like a mobile detailer. :D

Any suggestions about which pads to use? I have never been all that sure about when to use the 3 inch microfiber pads. My pc is an older model Porter Cable 7424. (I bought it 12 years ago and just can't wear it out.) I know..."start with the least aggressive approach." I've read that lots of times. :xyxthumbs:
 
Hey, if your guy says CLR is ok, that's good enough for me, I just happen to have at least a couple of automotive acids on hand, so I would just use them.
 
CLR works wonders. If the pictures work Its a 2015 Honda Civic that was parked in an underground parking garage under a broken drain pipe.
I used CLR undiluted directly on the stain. Let it dwell for a few minutes and then washed away. Some spots I had to do a couple of times but looked good as new in less then 10 minutes!

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Trickstr888 said:
CLR works wonders. If the pictures work Its a 2015 Honda Civic that was parked in an underground parking garage under a broken drain pipe.
I used CLR undiluted directly on the stain. Let it dwell for a few minutes and then washed away. Some spots I had to do a couple of times but looked good as new in less then 10 minutes!
Click to expand...

And there you have it.
 
I should have said that it did loosen the glue a bit on some clear plastic paint protector around the rear wheel well that was already damaged. Once it dried it stuck back into place. I have had the stuff drip full strength on all kinds of things accidentally (wheels, tires, rubber trim, etc) and never had any issues. I get this problem all the time at the end of winter.
 
Yeah, well, that's why I like the idea of that Optimum MDR, it's a gel so it should run less...of course I haven't used mine yet.
 
Re: Lime/calcium blotches on car? Update

The stains definitely were calcium/lime deposits from the parking gargage. They were not heavily crusted and were about the thickness of a layer of paint. A 100% white vinegar solution worked...no distilled water, no ISO alcohol. I heated vinegar to about 120 degrees and applied it to the affected areas with soaked swatches of cotton flannel. I let the swatches soak on the deposits for about five minutes and then gently rubbed the "crud" away. I finished up by washing the vinegar soaked areas and then applied a bit of wax. There was no evidence of etching or marring.

I didn't have to use the CLR, but I was ready to give it a try.

Thanks to all who offered suggestions.
 
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