Barb wrote:

Any suggestions for a really good, effective cleaner anyone ?

Yes, a power washer! You won't believe how effective they are at cleaning
patios etc, plus no elbow grease needed. The other advantage is that
males are genetically programmed to adore playing with them, so if you
have one of them around (a bloke that is) you'll never have a mucky patio
again.

Pressure washer = big boy's water pistol :-)