Epsum factorial non deposit quid pro quo hic escorol. Olypian quarrels et gorilla congolium.
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Bleaching will only break the yellowed plastic sheet because it is too corrosive; if you don't want to change it, consider scrubbing with an alkaline surface and then wiping it with water.
When I learned plastic processing, the yellowing indicates that the polymer has been aging and decomposed. An irreversible chemical reaction has taken place and cannot be restored to the original... it can only be replaced. Don't let it shine in the sun for a long time, don't touch the chemical acid and alkali things, so the plastic can last longer.
You can buy a bottle of water to bleach.
It is best not to use 84, which may turn yellow after bleaching.
Dip with vinegar
Add salt water with lemon or lemon juice