worms said:I've never understood why there isn't a domestic-scale gravel-cleaning equivalent of the ballast-cleaning machines that the railways use. Surely it wouldn't be that difficult to build a powered rake that would lift, clean and re-lay the gravel - essentially a mini-tiller, with a power-harrow attachment, a blower to separate off the lighter organic matter from the stones and a receptacle for the waste. I'd gladly hire such a beast for a few days and world-wide there must be a big market?
Based on the amount of gravel we have a gravel cleaner would be good here. Alas Google didn't help

However, I did come across a post suggesting drilling lots of holes in a wheel barrow and then washing the gravel with a hose.
Not ideal as you could have a lot of waste water to manage but the concept has started my mental cogs ticking.