The phenomenon you are talking about should be the result of your long-term use of this card sleeve and its gradual loosening.
In this case, to be honest, no matter how to recover, it is impossible to reduce it to your satisfaction. Because the relaxation of silicone series is basically impossible to recover, you can try to put a box similar to a mobile phone in the carton.
Then put your enlarged card holder in (make it as big as your mobile phone, shrink it to a certain extent, and then put it in the freezer. Freeze for a while.
It will be better to see it the next day, but it will not return to its original state. I suggest you be patient and find a new and identical mobile phone case to replace.
Of course, if you don't want to change, it must have a unique meaning in it. I hope it helps you.
2. What should I do if the transparent mobile phone case turns yellow?
Methods/steps
First of all, you can try to clean its body with toothpaste, which should be gentle, provided that the phone case turns yellow because of unclean skin. Squeeze toothpaste on the surface of the case and clean the surface of the mobile phone case by hand. Some dirt can be rubbed off with our wire for washing dishes.
Although the phone case is still a little yellow after rubbing, the oil stains on it are very clean, indicating that the yellowing is due to oxidation. What? Is the edge still dirty? If you are too lazy to take toothpaste, you can also wipe it with an eraser.
If you don't have the above things, you can also replace toothpaste with soap and rubber with alcohol. Soap can just remove grease.
If the mobile phone case is stained by coffee, tea, cocoa and other beverages, it can also be cleaned with bleach, but bleach has a chemical smell. If you use bleach, you can ventilate the phone case.
After the above steps, although the mobile phone case is a little cleaner, it is still retro. You can't just clean it up. Don't use disinfectant or anything. Those corrosive ones should not be used indiscriminately.
3. The mobile phone case is dirty, what should I do?
Try with an eraser.
My mobile phone is Sony Ericsson Z520, which is white and super easy to get dirty. It's useless to clean the hulls with water and other detergents. Later, I tried to use an eraser, which was quite effective.
I'm not sure about the shell material of 550C, but if it's the same material as 520, I think your problem can be solved. At first, I used the mobile phone carelessly, put it beside me, and ground a wire on the back shell. Wear is the dirtiest place. Although it can't be recovered after wear, there are basically no lines after using the eraser, which does not affect the appearance.
But one thing should be noted: use a light-colored eraser, be patient when you wipe it, rub it for a while, and then blow off all the debris ~ ~ ~
I hope I can help you. Organic solvents such as nail polish remover and alcohol also have a good decontamination effect, but I am afraid it will damage the mobile phone shell. You can try other methods if you really can't, but your beloved mobile phone, you'd better not take risks, hehe!
Hehe, give it to me. My mouth is watering ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
4. What should I do if the transparent mobile phone case turns yellow?
Silica gel products and plastic products will gradually turn yellow, harden and become brittle with the increase of use time, which is an irreversible process.
Rubber usually contains sulfide. After a long time, the sulfide is oxidized and then turns yellow. Yellowing of plastics and rubber is one of their basic characteristics. There are many reasons for yellowing, but the most important one is the influence of ultraviolet rays. In the process of use, sunlight and light will produce ultraviolet rays, which will make the plastic yellow, but yellowing does not affect its basic characteristics such as hardness and service life.
If yellowing is caused by tea, coffee or other stains, it can be treated with detergent or bleach. If it is caused by the above service hours, you can consider changing it. Generally, mobile phone silicone products will turn yellow, but the surface will turn yellow. You can buy organic solvent in the mobile phone shop, or scrub it with deoiling facial cleanser for two or three times to remove the silica gel on the surface.
And 84 disinfectant has the function of bleaching. You can try it in the bubble. Note that I haven't practiced, so be safe!