I would suggest an "all natural" dish washing liquid and a damp sponge. I have heard that alcohol and the rubber do not get along very well.
Copyright © Nikonians 2000, 2013
All Rights Reserved
Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.