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You can SUe polish as it is most suitable for big and heavy scratches, although that method is strictly for GLASS SCREENS.
Second most trusted is the Tooth Paste method. Apply and Rub Gently.
Many different websites say that there are several ways to try to remove scratches from cell phones, but none of them are guaranteed to work, especially if you have a lot of really deep scratches. So you may have to keep trying till you get the results you want. Perhaps even a combination of several… Each item is applied lightly to a clean, soft cloth. Then you apply to the screen with a gentle swirling motion. Kind of like applying a wax job to your car.
1) Tooth Paste – Seems to work well with the advantage of a better smelling phone. But use the Paste type not the Gel type.
2) Baby Powder – Mix it with a little water and create your own paste.
3) Baking Soda – Not only good to keep your refrigerator smelling fresh, but can do some amazing things with scratches as well.
4) Brasso, Silvo or other leather care product, has the ability to get into the scratches and remain clear. Unfortunately they have a strong smell.
I hope you can see the pattern here. I looks like different types of pastes and creams are what you should be shooting for. If these don’t work, go to your local pharmacy and see what non abrasive pastes & creams they have
I found this while doing a search on Google, as my phone has very light scratches on it aswell
Here try this link . . .It has a few ways to get rid of scratches in the 3rd paragraph
Nothing I've ever found will really fix it. There are all sorts of things I would consider little better than folk remedies, such as the suggestion to use toothpaste to buff it out (which does work on yellowed car headlights, incidentally). I assume your HTC has a glass display, but if it has a plastic screen, I've found that Eagle One Nanowax makes small, shallow scratches much less noticeable for a week or two, then you have to reapply it. This is a completely clear synthetic "wax", not the traditional type that dries white, and it isn't abrasive so at least it won't make things worse. I've tried the Turtle wax thing, and it was a waste of time. I'm not sure if it would work as well on glass.
One thing to be aware of with anything you use is that if it is abrasive, it could remove the protective coating that is on many, if not all, glass screens. I've seen the results of that on an iPhone, and it was not pretty, so be very careful about what you try.
I wish I could be more encouraging, but I suspect you're stuck with the scratches. I found this article on Popular Mechanics in which the author tries a few recommended remedies (Turtle Wax, 3M car scratch remover, Displex and glass buffing). Nothing really worked.
Here's an older article (from 2008) that lays out a method for removing scratches from a cell phone screen. I have no idea if this works, but according to the author, the procedure requires the use of microfiber cloth, an egg, aluminum foil and alum (a potassium aluminum sulfate sold in drugstores).
Good luck. If you find something that does the trick, let us know!