Concentrated calcium / mineral deposit on trunk?

**rtcpenguin** · 03-09-2010, 10:32 AM

I parked my car in an underground garage during a heavy rain and it looks like some water with minerals / calcium dripped out of the concrete ceiling onto my trunk. Theres white spot about 1" across with a trail going across the back of my trunk. I figured it would come off with a typical wash but no go. Also tried scraping a small portion with my fingernail, but that was causing abrasions.

Any ideas?

**JohnKleven** · 03-09-2010, 10:35 AM

You will probably need to wetsand the area and polish. I recommend you leave this to the professionals if you`re not familiar with the process.

John

**Multitask** · 03-09-2010, 11:32 AM

Try a 50/50 mix of water and vinegar. Let stand a little bit rinse with water and see how it looks.

**rtcpenguin** · 03-09-2010, 03:24 PM

I tried soaking in pure vinegar for about 10 minutes and that didn`t soften it up at all. I took it to my great local body shop and they tried a chemical wash (did nothing) and then the guy buffed it out. FREE . He said its possible a "shadow" may come back but for now it looks great. Shout out to Quality Auto Body in Fairfax, VA . These guys rule.

**rcrobbins** · 03-09-2010, 05:22 PM

There was a thread about this problem not too long ago. A car had been covered in those deposits. Nothing would touch it and had to be wet sanded, but on the bright side it came out great.

**bryan** · 03-10-2010, 08:26 AM

vinegar and water or a light acid

**imported_spielnicht** · 03-10-2010, 08:35 AM

Try this: http://www.autopia.org/forum/pro-det...ge-repair.html

I got the same on my car, but I was able to wipe it off immediately, 99% came off. I`ll tackle the rest when I detail the car in the Spring.

**Accumulator** · 03-10-2010, 10:44 AM

Vinegar might not be strong enough. I`d use the acidic portion of a decontamination system. Namely, AutoInt/ValuGard`s "B". Let the chemical do the work and *then* see if you need to wetsand/etc.

Link: http://www.autoint.com

**vtec92civic** · 03-10-2010, 11:06 AM

You might also want to try something like:

Goof Off . . . . . not sure how long that stuff has been sitting on your vehicle or maybe something like a paint thinner