There's a lot of that kind of stuff that goes into signal-cleaning in observatories, especially those located near major cities (like the Lick Observatory outsi

There's a lot of that kind of stuff that goes into signal-cleaning in observatories, especially those located near major cities (like the Lick Observatory outside San Jose). But it tends to be pretty site/telescope-specific, full of in-house custom code, so I'm not sure if there's anything good that a regular photographer could use to produce the same effect.