U get very soft lens cleaning cloth. I got a Tokina lens cloth at Cathay. Some filter like Hoya super-HMC recommend not to use cleaning solution like lens cleaner liquids. In such case you have to use this cloth.
Don't every clean your lens unless it is really necessary! You will not get it cleaner as before. Buy a big bubble blower and just blow off the dust. Get a good filter to protect your lens...and just clean the filter, but not the element on your lens.