This kind of hazy glow is very often caused by oil or smudges on the lens, not just ordinary dust. Fingerprints or an oily film can spread light and lower contrast, especially around bright light sources. If you use an interchangeable-lens camera, check both the front and rear lens elements.

To fix it:

1. First use a blower or soft brush to remove loose dust.
2. Then clean the glass with a clean microfiber lens cloth or other lint-free lens-cleaning material.
3. If a dry cloth only smears it, the lens likely needs proper wet cleaning with suitable lens-cleaning fluid.
4. Make sure the cloth itself is clean, or it can spread oil around.

For prevention, avoid touching the glass with your fingers and keep a clean lens cloth handy.

Editing may improve the photo a little by increasing contrast or reducing the haze appearance, but if the softness and glow were caused by a smeared lens, you usually can’t fully restore lost detail. The best solution is to clean the lens correctly before shooting again.