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.
I live in west central Scotland - not where that photo is...
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.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Just my opinion.
I live in west central Scotland - not where that photo is...