noun

• (countable, uncountable) The washing out of the eyes with copious solution (usually water alone) to quickly remove an irritant, as for example in laboratories and industrial plants; the washing solution itself.
  "an eyewash station on every floor of the building"
• (countable, uncountable) A soothing medicated lotion for the eyes.
• (uncountable, slang, figurative) Camouflage; disguise; false front; pretense; nonsense.
  "Near-synonyms: whitewash, window dressing"

verb

• (intelligence) To keep information secret by sending false information to many people in one's own organization, and correct information to a select few.
  "But others said that eyewashing was a standard security practice that had been in existence for decades."