Plastic Razors Are Expensive

The number one way to make blades last longer is to wash your face with soap and water before you shave. The oils on the skin and beard will react with the soaps in shaving creams to create a waxy build up on the blades destroying their effectiveness. Washing first removes the oils so that they won't react with the shaving cream when you shave. It also removes the salt deposits from dried perspiration that can further destroy the blade edge.

Also make sure to completely rinse the blades after use with the hottest tap water you have to clean off any residue.