Yes. As specified in section 11.3.4 of the CIRRUS user manual (Cleaning Heavy Contamination), lenses should be cleaned using only water, isopropyl alcohol and acetone. Up to 99% isopropyl alcohol can be used for cleaning CIRRUS optical surfaces.
Cleaning of optical surfaces can be done as much as needed (such as between patients), but there will be an increased risk of damage to the optical surfaces if hard particles are present on the surface and too much pressure is applied. Be sure to follow user manual cleaning protocols.