The Air Accident Investigation Unit in Ireland has reported on an incident where the flight crew's visibility was compromised by sea salt
Many years ago I was involved in flight calibration of the Australian T-VASIS at Townsville, Australia. Erroneous indications were evident until engineers had a closer look at the T-VASIS system at one end of a runway that was relatively close to the sea. Salt water spray had impinged on various lens causing refraction and thus erroneous indications.