Removing silicone caulk from counter
A utility knife works pretty well for me.



If it truly is granite, it is difficult to damage with steel blades, except by repeated slashing.

Of course you won't be able to remove every shred of the old caulk, but as long as there is significant clean and bare edge in the gap, it is good enough to hold a new application.

A powerful shop vacuum mated to a crevice tool slowly run along the gap should do great job of getting all the dust and crud out and maybe remove some loose old caulk unreachable with the knife..