Today, I had a small mishap while riding. I was riding along and could see myself headed towards sand, so I clenched up and grabbed the brakes which caused me to skid into the sand. I did not fall fast, I basically tipped over because I did not get my foot unclipped, therefore I fell gently in the sand. As I was riding throughout the day I realized that my shift lever is very rough when I push it. There is sand jammed inside the shifter, causing the roughness. How should I clean my shifter to get it back into perfect working condition?