Can someone recommend a good cleaning kit for my nightforce scope? when I go out shooting the lens gets a little dirty due to all the sand and dirt flying around so my original plan was to use low pressure compressed air across the lens (not directly at it) to get rid of dirt particles first. then I would use a q tip dunked in rubbing alcohol to clean the lens and then follow up with the lens cloth that came with my scope. Is that a bad idea or should I go with a reputable lens cleaning kit? Thanks