Those folding japanese saws are great for sawing soil/roots/dirt out of cracks and of course for sawing small bushes/trees that are too big for clippers. A regular screwdriver is good for smaller cracks.
The stiffest wire brush you can find will be good for cleaning surface lichen/moss.
Highly recommend goggles and face mask while cleaning to keep that shit out of your head. Inhaling lichen/moss is probably not good for you, and is certainly painful in the eyes.
Those are the things you otter use.