After spending a lot of money on a speargun, I would make sure to take care of it as best as possible. I tend to look at spending money and how it equates to a Baja trip. For example, if I damage or lose a speargun, then I will spend the same amount of money repairing or replacing it than a 3 or 4 day trip to Mexico. The point is that spending the proper amount of time caring for your equipment can lead to more time underwater hunting. Here's how I recommend you care for your speargun:
1. Soak your speargun in fresh water: Rinse your speargun thoroughly with fresh water as soon as possible after use in saltwater. Then I soak the speargun in a bucket starting the the end of it first, followed by the muzzle end. This will help to remove any salt residue that can cause corrosion and damage to your equipment.
2. Disassemble: Disassemble your speargun, paying attention to any small parts that need to be removed and cleaned separately in order to avoid rust like the picture below.
3. Clean: Clean all parts of your speargun with fresh water and a mild soap solution. Use a soft-bristled brush to gently remove any salt and grime from hard-to-reach areas.
4. Lubricate: Apply a small amount of silicone or other suitable lubricant to all moving parts, including the trigger mechanism and the shaft. This will help to prevent corrosion and keep your speargun working smoothly.
5. Store: After cleaning and lubricating, reassemble your speargun and store it in a cool, dry place away from direct sunlight. Make sure that the spearshaft is removed and stored separately from the rest of the speargun.
6. Regular Maintenance: Perform regular maintenance on your speargun, including checking for any signs of wear and tear such as rust, tightening any loose screws or bolts, and replacing any damaged or worn parts as needed.
By following these steps, you can help to extend the life of your speargun and ensure that it stays in good working condition for your future diving adventures.