I use old, contaminated Berryman's B12, a carburetor cleaner, to clean old paint off hardware (fender bolts mostly) before I bead blast them. Get a gallon of Berryman's and a steel pan (like a cake baking pan) deep enough to hold the top. A second one to clean the linkage might help.
Now, ask yourself. Why did the P/O paint the top, rust on some steel pieces possibly?
Jim