Ahhh powdery mildew on my Atlantic giant!

[deltz]

After all this rain I went to check on my pumpkin plant and at the moment 2 leaves have been affected by it!

I want to act fast what can I spray the leaves with to try and stop it?
Would something like fairy or milk diluted in water stop it? If so how much ratio for fair and milk to water?

Many Thanks

[MalUK]

Between 10 and 30% milk, too little and it's ineffective, too much and it'll create its own problems. You can also use sodium bicarbonate, but test it on a small area for a few days to make sure it doesn't burn the leaf.