When I set the splashes on my granite tops, any ooze that occurred with the silicone, I wiped to the best of my ability. with paint thinner. The trick is to govern the amount you use so it lessens the mess. That said, with the ooze that did happen, since the paint thinner made everything so shiny, even with many, many repeated wipes with a moistened cloth, I still left a bit here and there.
To remove the excess, I used a razor knife blade, without a handle, the handle of a razor knife forces you at an angle, so the whole edge of the blade cannot make contact with he countertop surface. I did make a duct tape handle. It took a good number of wraps to make it thick, no more than a 1/4".
This will not be kind to the fingers, it will hurt, it may even be a bit dangerous, mainly behind the faucet, but it worked for me, it got the corners precise, the surfaces clean. Always use a new blade!!! If you have a lot to do, say over 20-30 ft., change blades, keep the edge pristine!