I have tried a similar process on some very yellowed air vents, I filled a laundry tub with 50% bleach and 50% water, after soaking for a full day the plastic is still a bit yellow but only half as bad as before. Do you recommend trying to let it soak a few more times? I think the problem may be the lack of sunlight in the laundry.
Hi Ben, thank you for your message. Light is an important ingredient for the process, so a transparent container is recommended.
If you are going to give it another turn, please was the parts well. The detergent forms a residue on the plastic and it builds up after each soak. And the more it builds up, the harder it is to remove.
Hi Tania, not sure what a Marybelle telephone is and what it is made of.
If you want to do something about the discolouration properly, you will need to take it apart. I any case you will need to wash the parts of the body shell.
I do not know what material your phone is made of. Bakelite? Plastic? Marble?
I made good experiences with hair salon Peroxide creme for bleaching. I used a small paint brush to apply the creme to the yellowed parts. It’s a white Italian “Grillo” phone which wasn’t too bad, but still yellowed. I presume it is ABS plastic. The creme I used was 6% Peroxide and available online. In the local drugstore I only found expensive dyeing kits, the peroxide creme itself is cheap. Stronger stuff bis also available.
Once applied, I put the parts into a freezer bag and into the direct sunlight.
I also tried just brushing on some creme and not using a bag. The creme dried up, but still worked! It could be cleaned off with a damp cloth later. This way it would not be required to disassemble a phone completely. But I would still not recommend to use it around an assembled keyboard etc.!
No warranties given whatsoever 😉 better try carefully.
Best regards, Dietrich