Japanese feature

I'd always wanted to give a corner of my garden a bit of a Japanese theme which I finally did a couple of years ago. I was very happy with the results and although I didn't have a water feature, managed to create a mock winding stream made from medium size white pebbles.... all good so far! I was doing some maintenance to it recently, moving some plants that were in the wrong place or outgrown their spot but the 'stream' has started to look a bit grubby, probably from a combination of weather and age etc. Just wondering if anyone can suggest a way to clean the pebbles without having to dismantle the stream and scrub them individually please? Someone suggested a bleach solution but I'm obviously nervous about that damaging plant roots. Any suggestions gratefully accepted thanks 😊
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Shade and damp will always create a problem, so if the rocks aren't in sun, they'll just keep discolouring.
You'd have to lift and scrub with a brush.
Difficult to be any more accurate without photos.
Paint with up to 3 layers of clear acrylic varnish then, when dry, replace. See if it helps keep them dry and stop them growing algae and other grubby looking stuff.
Just my opinion.