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Will ddac cut through any surface dirt and get at black spots below? Naively when I first started I’d just throw hypo down not rinsing down before, it would eat away at surface dirt but nothing below so I’d be using twice the amount and taking twice as long.    Cheers for the info, what about...

Hi all I hope everyone’s good! Another Hypo question for you all, I’ve somehow managed to avoid driveways with run offs into the street until now, I’ve got a few coming up that are bad with black spots so ideally I’d want to use hypo. Is this a no no with the excess going into the street even if...