MrWeld wrote in message ...
A relative has about 80m² of gravelled areas around their house. Over the
years, the gravel has become very muddy, and is now coverered with weeds.

Is there a cost effective way of washing gravel? I've tried putting it in
a handheld steel sieve sloshing it around in wheelbarrow of water, but
that was very slow, and generated large quantities of muddy water.

I suppose I could just put a membrane on top of it, followed by more
gravel, but I'd like to re-use the existing stuff.

I had a much smaller amount but I power-washed it in situ and it did a good
job. I only needed the top level to look nicer and it certainly did that.
Probably worth just piling up a small area at a time, remove the weeds & lay
the membrane, then put the gravel back and jetwash it all at the end.