Since i can't see them - it either could be mildew or maybe some little bugs. buts, you can spray away with water or a soapy solution - just a little bit of dish soap in a spray bottle and wash them off.
Mildew - I don't know if you get that in a tropical climate -but let me sent you a link. https://www.thespruce.com/powdery-mildew-1402500
If it is mildew, please use the non-poisonous ways to treat them :)
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I have hosed them down with water - with a vengeance too, they fly off and then come back. This is what they look like... The Hubs says they are called White Flies
