Fragile optics - EOTech Mini Red Dot Sight Basic Kit

Acquired this as a target finder for bird photography, not for any 'rugged' applications such as target shooting, i.e. light and gentle usage. Well the optics soon gathered dirt and grease, so I gently brushed and wiped off the surfaces with a "lens cleaning solution" as instructed in the MRDS User Manual. This was the popular Zeiss brand of Lens Cleaning Solution which contains alcohol and mild detergent, no ammonia. I have used this Zeiss Lens Cleaner to clean grease off all of my multicoated camera lenses, optical filters, microscope objectives and eyeglasses for many years without any problems at all. Unfortunately, this stripped off the optical coating on the MRDS, turning it into a $500 paperweight. Not impressed :-(