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I almost always try to be careful when taking pictures avoiding things that I don't want to come out, but in this case I removed the dirt by cropping the image and cloning areas, I worked in Lightroom and Photoshop to get the result I presented to you.

I also always shoot my camera in RAW, which allows me to have better control over the information in the photograph so I can bring up the shadows, lower the highlights, and change some of the color tones.

Thanks for the info. This was really helpful.