I have these brown dots on my car and found out that it is Artillery fungus. I park my car near 2 flower beds that have mulch. Since the mulch is always wet (another factor is I buy inexpensive mulch) spores are formed in turn this fungus shoots up into the air and forms brown dots on my car.
I have tried nail polish remover, hand sanitizer, used a credit card and WD40. None have worked and the Internet has no other ideas to remove these pesky brown annoying dots.
If it is truly fungus, then it is another form of yeast, and vinegar or another mildly acidic substance will immediately kill it. Try vinegar or lemon juice.
If it were mine, I'd begin methodically on the lowest place and work in a two inch line around the bottom edge in sections, according to how many products I am trying. I'd consider in this order:
straight tilex. Follow instructions, rinse.
1/4 Bleach in 1 cup water with 1/4 tsp. Dawn.
Bathroom cleanser spray foam.
Baking soda paste rubbed very gently on spots
Check each one every ten minutes to see if it's working and which works best. The one that works the poorest, leave overnight before rinsing. The one that works the best, should show up right away.
If none of the above work, i'd be -v e r y - tempted to try oven cleaner for only ten minutes then test. If no sign of working, rinse off unless using the no-fume, in which case i'd leave on one hour, testing every ten minutes.
I'd be very surprised if none of these worked. Please let us all know, ok? God bless and help you. : ) .
Don't know about this mold, but I have had success with spray disinfectant to kill molds/fungi in the past. If you have tried alcohol-based products, you will need something stronger! Hope it doesn't ruin your finish. I have some spots on my car & they seem to be from a spray of concrete? Almost easier to get touch up paint, sand it down & cover it up.
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