Best way to clean and fix the pavement

I have stone pavement (?) in my backyard around the pool. I have not tended to them and so there is moss growing on them. I intend to clean them but was wondering what the best way of cleaning it would be.

I tried pressure washer cleaning it once, but it seemed to chip the stones and also the concrete between the stones so I stopped. Is there a better way to clean them and remove the moss or is pressure washer cleaning but perhaps at a lower pressure the best way?

Also some of the sections are really old and sinking in. You can see that in one of the photos where it's collapsed and a small hole has appeared. I am wondering how that could be fixed and/or who I could call to fix that if at all.

Thanks

 Moss and grimeLike  ⋅  Add a comment  ⋅  Pin to Ideaboard  ⋅  Share

 Sunken sectionArea has collapsed a bit and so a hole has formed.Like  ⋅  Add a comment  ⋅  Pin to Ideaboard  ⋅  Share