In order to keep your rubber blade in top condition, it is recommend every few months rubbing it with a cloth and some soapy water before applying a small amount of vegetable oil to the surface. This should help keep the blade supple and prevent degradation. Do not submerge the whole trainer in water and avoid getting water on the bolts as this may promote corrosion. Please note that some blade degeneration is to be expected with use. It is not advised to use these trainers against metal swords as this will shorten the life of the blade.