is mildew covered lambs' lettuce edible?

I was about to pick my lambs lettuce for dinner, when I noticed a lot of the leaves are covered in mildew. Even if I try to pick for eating leaves which look reasonably unaffected I would be bound to end up eating some, so does anyone know if it's safe to eat? Would washing it off before eating be okay?
Seems such a shame not to eat it after going to the effort of growing it, please help!
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