A carpet knife can work well for cutting away old caulking from house siding. Slice down alongside it from both directions with the hook-like blade, then use the knife to lift out the old caulk bead intact.
Once a small part gets lost in grass or on floors, you can waste a lot of time looking for it. To find it quickly, put a nylon stocking over the end of your shop vacuum hose and fasten it with a rubber binder. Turn on the vac and play it over the area where it might have gone. If the part is there the vac will suck it up and hold it on the nylon so you can just pick it off.