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The car is a white Toyota Camry 2012.

As you can see there are many tiny black dots on the roof. I can't remove them by scratching by hand or with a high water pressure cleaner.

enter image description here

What caused these dots? What can I do to remove them?

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  • We once had a release of "harmful dust" at a steel plant that damaged the paint of nearby cars. Reminded me of that. Just posting this as a comment to remind that chemical release is of low probability but can still be a possibility
    – Martin
    Commented Apr 25, 2019 at 19:38
  • Are the spots elevated, recessed or even with the paint?
    – Martin
    Commented Apr 25, 2019 at 19:39
  • I too have these little black deposits on my car. I've tried several cleansers with none being efficient. Bug and tar remover is my next attempt. They are more easily removed when the temperature was below 20F. If you find something that works well, PLEASE let us know.
    – B540Glenn
    Commented Apr 25, 2019 at 20:05
  • Windex or window cleaner with ammonia works well for me, and is a lot cheaper than aerosol BugNTar type removers.
    – SteveRacer
    Commented Apr 26, 2019 at 2:42

9 Answers 9

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Looks like tree sap indeed.

The best way to remove it is to use a clay bar after a good pre clean without putting too much pressure on the paint.

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  • 1
    I have these also. Paper towel, cloth, sponge and fingernails don't remove them. I doubt a clay bar will.
    – B540Glenn
    Commented Apr 25, 2019 at 20:07
  • I'd encourage you to try anyway, it will take some time but trust me, all the contaminants will eventually be scraped off. :)
    – Pierre P.
    Commented Apr 26, 2019 at 8:04
  • I do have a clay bar kit that I planned to use after getting all the specks off. I'll try it a little earlier. Thanks :-)
    – B540Glenn
    Commented Apr 26, 2019 at 13:10
  • Good! Let us know how it went and don't be afraid to spend some time on it, the result is worth the time investment.
    – Pierre P.
    Commented Apr 26, 2019 at 13:11
3

The cause can be one of many possibilities:

fly spots

tree sap

or worse paint overspray

The first two should come off - good cleaner / polish and lots of work, but the paint may mean that you need a re-spray at the worst - there may be a professional treatment that could do it. So go and see a good paintshop and see what they say.

2

Looks like tar spots to me - unusual to have that many on the roof but not impossible.

Try a dedicated tar remover - Autoglym do a good one (called "Intensive Tar Remover" IIRC) that should have a good chance, it also works well for tree sap (which is another likely culprit).

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I removed mine effortlessly with a spray bottle of Spic and Span and a washcloth.

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They are artillery fungus caused from parking near wood mulch. Read up on it. Very interesting. Very hard to remove. You must do one at a time. Ugh.

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We had little black spots all over our Motorhome We tried Allsorts the only thing that got them off was Pink Stuff paste and a sponge this was amazing. Pink Stuff available from £1 shops

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It is definitely some type of fungus. When I used Clorox cleaner it did come off but I don't want to do alot because I don't want to damage the clear coat

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    – Community Bot
    Commented Apr 9, 2022 at 15:22
-1

My guess is tree sap that then takes in road dust which hardens over time. Just today I’ve tried iron spray and tar remover , no joy, used clean slate by chemical guys too. Gonna finish cleaning the rest of the car and set aside a day or two for this. Going forward I’d recommend getting a good wax or sealant or coating on the roof and keep on top of maintenance.

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  • That answer has already been given.
    – Chenmunka
    Commented Nov 24, 2021 at 19:34
-2

Her is a good news video explaining the source of the problem: https://www.wdbj7.com/content/news/Black-spots-on-your-car-could-be-from-a-nearby-fungus-in-your-mulch-509250841.html

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  • 1
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    – Community Bot
    Commented Apr 14, 2022 at 17:29
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