How can I make disposable razors last longer (prevent rust/dulling)?

After each shave, rinse the blade under hot running water to flush out all hair, soap, and cream residue. Pat the razor head dry with a towel (avoid pressing directly on the blade edge) and store it upright in a dry spot outside the shower.

Run the razor backward (away from the cutting direction) along a flat piece of denim for 10-20 strokes before each shave. This realigns microscopic burrs on the blade edge, restoring some sharpness without removing metal.

After rinsing and drying the razor, apply a small drop of mineral oil, baby oil, or cooking oil to the blade surface. Spread it lightly with a fingertip or cotton swab to form a thin protective film. Rinse the oil off before the next shave.