Some of the older and lesser versions of road shift pods have a good access to the internals (or good for Shimano, no where as nice as Campy
) and air blasting solvent out, oil in and some coating of grease is quite easy. But the better grades and newer versions are rather well enclosed. Still air blasting and thin then thick oil soaking does a nice job. I have used a needle injector (Lil Phil gun) to augment lube with grease best possible. I do remove the lever/pod unit from the lever body. Makes this stuff far less messy and the flushing more complete. Andy