The bleach contains sodium hypochlorite which can etch the stone leading to accelerated erosion, “sugaring,” and yellowing of the stone surface.

The best method is the gentlest possible. Plenty of clear water and a soft natural or synthetic brush.

There are solution such as D/2 available which remove and prevent (for quite a few years) future biological growth.

All that being said, you should really ask yourself what the reason and goals for cleaning the stone are.

An 80 year old marker shouldn’t look as if it were placed just last week. I would only clean if biological growth were threatening the integrity of the stone.

It really works well to protect the granite from stains and it shines like crazy. I use it often and it keeps my granite looking brand new!

It works really great. My ubatuba granite shows off the shine and cleanliness after using this product.

It seems to also reseal it because we had a few spills of oil and vinegar and did not affect the stone.

We use it every other day for cleanup.

It cleans without leaving streaks even when cleaning greasy spills.

It has never left a residue behind on the granite. I highly recommend it to anyone who is having trouble with streaks on their granite. Using glass cleaners or vinegar will strip the sealer off your granite. This cleaner will not and works great!

It was recommended by my countertop installer and just love it.

It leaves no film and leaves a beautiful shine, like new.

You can get products in most countries specifically for the job but bleach works wonders too.

Then get a shovel and scoop up the rocks and the crud that has fallen between them. Drop each shovelful into the water so that the rocks get cleaned off. When you have one section scooped out (since you probably can’t do it all at once) then scoop out the clean rocks from the water and put them back onto the driveway.

Then move on to the next section until you have it all done.