You should use the rocket blower on your lenses prior to cleaning. This way it will remove any particles that could cause surface scratching to the lens coating when cleaning. Also use it around the lens mount area before changing/removing lenses to avoid and dust getting into the opening when you detach the lens. 

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html