Myself, CD with physical brushes attached, and compressed air.
Not certain of isopropanol or any other solvent for that matter (I'd be concerned with the mount of the lens rather than hurting the lens itself, but a 99% USP grade isopropanol is also available at most drug stores; you just may have to ask for it.
Not certain of isopropanol or any other solvent for that matter (I'd be concerned with the mount of the lens rather than hurting the lens itself, but a 99% USP grade isopropanol is also available at most drug stores; you just may have to ask for it.