I am new to knife making and this forum. I made my first knife about a month ago and have been using it daily to see how well it holds up. I rinsed out my kydex sheath last night with some water and wiped off the blade with some denatured alcohol to remove some sticky residue on it. Today I pulled the knife out of the holster and there are some rust spots on the blade. The blade is O1 tool steel. What can I do to remove and prevent the rust?