I have used "Totally Awesome" found in one of your Dollarama stores in the USA. It's less than $2.00 for a liter spray bottle, spray it on a cloth rub it, it will begin to whiten. The original white will come back, I've used it for years on all white plastic, like marker light housings, trims, kitchen exhaust outlet hood, if you do it once a year,[painless really], it will stay looking white.
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