how to clean dirt/yellowing from old document

[Ofnuts]

(08-27-2022, 04:47 PM)gimptime Wrote: I am working on an old baptismal certificate. It has a white background. There is what looks like
dirt on some of the background, which I would like to remove. It is also yellowed to varying degrees
which I would like to fix. I have used the brush/pencil tool and painted some of those areas
with a lighter color from the background but its too slow. Any ideas would be greatly appreciated.

Thanks.

Some heavy JPG compression artifacts. Is this the original version or has it been recompressed?