No matter how hard you try, your sensor will eventually get a few specks of dust. Now, you have two options: clean the sensor, or clean the photos by removing the dust spots in post-processing. If you prefer the second method, this short video by Benjamin Warde will show you how to make sure you haven’t missed a single part of the photo.
If you use Lightroom to post process your “dusty” photos, then Spot Removal Tool is probably your best friend. Now, before you start cleaning the image, you want to make sure that you don’t miss any areas. This simple trick will help you inspect the entire image without missing anything.
First, click on the photo to zoom in, and then press the Home key on your keyboard. That will take you to the upper left corner of the image. When you’re done with cleaning this area of the photo, you can press the Page Down key and it will move down one screen’s worth.
When you reach the bottom, pressing the Page Down key again will move over one column in the top area of the photo, again one screen’s worth. You can keep on doing it until you reach the lower right corner of the photo and clean the dust in that part.
By using this method, you can be sure you haven’t missed a single part of the photo while cleaning it. Still, I recommend you clean the sensor. It will save a lot of your post-processing time, and maybe you can use this command for something else.