Ammonia gas is passed through the solvent to form a saturated solution of ammonia in, for example toluene. Once exposed to the air, ammonia slowly evaporates. The only answer is to bubble dry ammonia gas through the spent cleaning solution. The rinses are simply pure solvent in the form of toluene, white spirit, or Xylene, a lubricating rinse contains not oil but a substance that deposits an ultra-thin layer on the parts. I cannot leave the skin without mentioning Silver as a potential poison.
Silver salts are present in the silvering compounds used for clock and barometer dials.
Quite rightly, the containers are labelled as poisonous and the salts should not be ingested. Solvents Solvents are found in many cleaning solutions throughout many industries. Carbon tetrachloride damages the liver leading to jaundice, liver failure and death. Ether is explosive and inflammable. To save confusion found in many books, I must emphasise that Benz ene is different from Benz ine , otherwise known as petroleum ether .