We had the exact same problem - not sure of the cause, either irrigation water or fert. Went up to Florida Paints, they sell a product called "Magic" for $20 (probably similar to Ace Hardware product). Picked up a small $5 pump sprayer at Home Depot. Mixed up a batch and sprayed both stucco and vinyl. everything disappeared in less than 2 minutes. It was pretty amazing. Did entire perimeter of the house in under 15 minutes.
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