image was taken from phone and unclear. help?

[WhyDoWeExist_]

I have an image that was taken with a phone of a screen and need to clear it up (by removing the weird blu lines and clearing it up) but its finicky to do it with the bucket tool do you know a better way I can do it? and no i don't have it on my computer it was from the internet

[tmanni]

If you want a clean, noise-free image, the easest thing to do is to recreate the image from scratch.
Here I use 4 layers (one per colors), the Path tool to create the main shapes, and a combination of Filters > Render > Patterns > Grid and Filters > Distorts > Ripple/Whirl and Pinch to create the lines.
 
   

[denzjos]

That's the best solution is what tmanni proposes. I've tried it with selections (and other filters to get good selections), and as you see, you can't get good sharp lines because the quality of the picture is poor. 

   

[Redraw]

Use of the fuzzy select tool and adjusting threshold could do that,
then delete that selection and replace with what you want in there