| before you decide to do anything further: Dry chemical fire extinguishers leave behind a sometimes corrosive powder and therefore must be cleaned as soon as the fire department deems the building safe. Follow these steps: Sweep or vacuum up loose residue. Break down the silicone found in dry chemical fire extinguishers by spraying the remaining residue with isopropyl alcohol diluted by half with warm water. Let the solution work for a few minutes, and then rinse with water. For monoammonium phosphate-based extinguishers, neutralize these dry chemicals by washing with hot water and baking soda. Let the solution work for a few minutes, and then rinse with water. For sodium bicarbonate and potassium bicarbonate-based extinguishers, neutralize these dry chemicals by applying a solution of 98 percent hot water and 2 percent vinegar. Let the solution work for a few minutes, and then rinse with water. Clean the area with soapy water and rinse. Blow dry the area to remove excess water and let it finish air drying completely.
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