You could pore ph neutral cleaner straight on top of spots, let it sit for about 5 minutes (don't let it dry), then with a new 4" scraper blade, carefully scrape it off. Becareful not to scrach. Wipe leftover spot with a rag that is soked in straight ph neutral cleaner. Then final wipe area with water and sponge .
Got either stucco or cement. Cleaning with nylon brush and stone alkaline cleaner. What can take stucco or cement of other than acid
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Dayron Padilla
Perfect Marble
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