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I've been using sunlight to reverse yellowing in old light grey and white bricks and it's worked very well. On the far left in picrel is a severely yellowed white 1 x 2 brick that I got in a bulk lot. Next to it are a new tan brick and a new white tile for comparison. I'm going to leave it on my windowsill for a week or so and post an update. The flag and panel on the right were from the same lot, and also severely yellowed (especially the panel). I've already had them in the sun for about a week and the difference is pretty noticable.
