If the pump becomes clogged, clean out with a pin/toothpick. Due to our pumps being real metal, oxidation (rust) can occur. We do not recommend using soaps with high amounts of lye, chlorine or essential oils as they will eat away at the metal pumps, causing them to deteriorate. Castile soap is not recommended as the oils tend to stick to the pump, causing blockages. The brass, stainless steel, gold and copper pumps are the most delicate metals and we recommend using a different color if deterioration is a concern.