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Help! White patches on mint again

Only planted this 2 weeks ago, in a pot, and it now has white spots all over it. Does anyone know what this can be? It seems to happen to every single mint plant I have ever tried to grow, whether in a pot or in the ground There is no sign of insect infestation and underside of leaves look same. It is also being eaten by slugs (grr) which I assume is unrelated.
I thought mint was meant to be easy!!
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Powdery mildew?
Nope, definately not that
Can't see it clearly with a zoom in, could it be leaf miner? Or maybe sun scorch from tiny water droplets?