By it being a solid film/milky in color more than likely the clear coat is burnt/blistered.When I say blistered its not the same as a body blister on humans as to raise the skin and pell off.Two things will cause this to happen to black paint with clear coat,either the chemical was applied to a every hot surface(black)or the degreaser is to hot.Some degreasers are not clearcoat safe......

When In Doubt Think It Out