wipe it clean with WD40 and 0000 (ultra fine) steel wool to remove the existing surface rust. Then wipe clean with a rag and spray the blade liberally with silicone lubricant. Wipe with a rag. The silicone lube keeps the blade from rusting.
- dont store a wet knife in the sheath
- wipe with a rag sprayed with silicone lube after use.