I had a low speed crash a while back on my road bike on some sand that a road construction crew had left on a steel manhole cover. The bike went down on the right hand side and my Ultegra RD got hit quite hard. Worst of all, though was the fact that it got covered in sand. There is now sand in all the pivots.
Any suggestions for how to get it out? I have spent ages with a rag and a small screwdriver but can't shift it all.
Can I just flood it with degreaser and hope? I considered a high pressure hose but was worried that would drive the sand in further.