Thanks for that tip Keith. We used a hard brush first, particularly on the joints, then power washed it quite carefully. We'll give it one more sweep with a soft brush before applying the sealer. Typically, now we're ready the rain's arrived; you need to be sure of 8 hours without rain following application.
Should be easier to keep clean once it's sealed.
We'll perhaps have a try with that Hypochloride on the block paved driveway and around the sides of the house. We used that Wet and Forget stuff on that area few months ago but it hasn't worked. Hypochloride sounds a heck of a lot cheaper too.
In exchange for that tip here's one for the quiz..... the singer liked to walk tall.....
"Life" is a gift to you. The way you live your life is your gift to those who come after.