How do I fix this hood problem?

That is oxidation but the paint is probably too far gone. A repaint is all you can do. What products did you try?

If the paint is original to the vehicle it might be worn thin from years of waxing and polishing. The white stuff you're seeing is probably the primer showing through the thin top coat. But if that's not the case (it's hard to be sure looking at a picture) you can try rubbing compound on it. Rubbing compound will remove a microscopic layer of the "dead" paint and restore the shine. Be sure to wax it when you're done with the rubbing compound. Hope that helps! Jim