A method of treating a glass cylinder for a piston-cylinder arrangement for reducing the friction of a piston on an inner cylinder wall of the glass cylinder includes: elevating surface energy of glass of an interior bounded by the inner cylinder wall and hence lowering a contact angle of the glass with water. The contact angle is lowered by: a gas discharge that acts on the glass at the inner cylinder wall and is generated by an electric or electromagnetic field; or the action of ozone on the glass surface. The glass with the lowered contact angle is contacted with water to form a water film on the contacted glass.