Polymer including silicone rubber is commonly done yellow due to the process of aging.
The process which is Irreversible is exacerbated when the polymer is exposed to heat light other than chemicals that are the problem with TPU is silicon transparent mobile case.
They just will turn yellow after a while yellowing of polymers material is due to the degradation reaction like thermal photo-oxidation radiation are oxidation agent action is chemical in nature so Irreversible you can not make them right through using any kind of chemical substance such as chlorine and peroxide.
Actually, this chemical may worsen this dechlorination as they are an Oxidation reaction agent.
If that yelling is just an aesthetic or problem and there is no application functional failure just use the product until it dies but if the disc coloration is important then it must be replaced by anyone.
How to remove yellow stains off your clear phone case?.
First, you take a different kind of powder-like bleaching powder, and put it into the box ate some tape water then make it frequently then add some drops of vinegar Little Mix it with agitator Now add some toothpaste, toothpaste is also a very useful cleaning tool. However, is it can reach our expectations for cleaning soft yellowing phone case? The answer is YES
now put your yellow transparent case inside the Sink or box now add some baking soda Two spoon Mix it and wait 2 hour
A lucid, clear case with glass-like clarity is perfect for showing off the sleek profile of your new phone. It will not turn yellow over time and always remains crystal clear. IN SHA ALLAH
The mesh back pattern on the interior provides a sleek and elegant look of breathability.