Invest in a 16 ounce bottle of Createx 5619 Restorer airbrush cleaner. Disassemble the airbrush and put the parts in a flat pan, similar to a microwave dinner plate. Pour enough cleaner into the pan to cover the airbrush parts and let it soak for 10-15 minutes. Remove the various parts. Use a soft toothbrush to remove any really tough paint residue and finish rinse everything thoroughly with running water. Save the restorer in an airtight metal or glass container, as its reusable. Reassemble the airbrush, lubricating it per factory specs. After every few painting sessions dunk the entire assembled airbrush in restorer for 5-7 minutes and then rinse with water, to keep it in top shape. If you still have issues I would check the fluid nozzle, it may be cracked or deformed. Jewelers glasses really help when looking for cracks or deformities in needles and fluid nozzles. Assuming your paint is good and all else fails, Createx makes a really nice 4020 reducer for extreme humidity and/or cold situations. Good luck.