Yes, they do darken over time. I've soaked it in baking soda and vinegar for two hours, twice in the 3 years I've had it on my phone. This makes it clearer. I think next time I'll use Peroxide 40 Volume from the beauty store. I smear it all over my body, wrap it in plastic wrap and leave it in the sun, repeating as needed. How my otter saved my phone from major damage before it had to be replaced.
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