Owain wrote:
rpgs rock dvds wrote:
Update - spotted workman next door, told him about problem, he came
round with bucket of light blue liquid (not sure what this solution
was) and he brushed liquid over patio slabs with an "outside brush".
After area dried out, most of discolouration has gone - prolly all go
if I give it another clean myself.

Alternatively the workman can come back on Monday with another bucketful
of light blue liquid and finish the job properly.

.... which of course means if the slabs dissolve in the next rain shower
it's still their problem...

Andy