Keep at room temperature. Neem oil has a tendency to go cloudy when cold. The fatty acids in neem oil crystallise at temperatures below 25°C causing the oil to solidify. As the temperature drops closer to the 25°C mark the more temperature sensitive fatty acids start to "clot" giving the appearance of sediment. This is a natural process expected in the product. The quality of the oil is unaffected if it has a cloudy appearance. Simply placing the bottle in a room above 25°C will result in the oil returning to a liquid state.