I was shooting on a beach the other day and it seems some sand grit has got into the focus ring of my Contax Y 50mm lens. I've tried blowing it out with an air compressor without success. My questions are: - is this the right approach to remove the sand? - if not is there another simple method that I can use to remove the grit? - if not is there a person/dealer in Australia where I can send my lens to be cleaned?