Just like the dust. Don't worry about the scratches if they are even there! If anything take the lens to a bright light source and purposly try to get flare / effects on the front element. A deep scratch might scatter the light going through. But I doubt light scratches will effect the pictures at all. Hard light right into the element at the right angles will amplify any effect from it! But I think it's time to just chalk it down as a lesson learned and try to move on. If your not seeing the coating melting off from the cleaner by now. I think your good to go.