The invention relates to the field of disinfection and preservation of surfaces of medical devices. The object of the invention is to make available a disinfectant that provides effective decontamination of medical devices while at the same time being toxicologically safe. This object is achieved through the use of solution containing biguanide. Additional advantages of using such solutions include the fact that the active ingredient used for preservation can be completely rinsed out prior to use and does not have a negative effect on the functionality of protein-containing medical devices. The thoroughness of the rinsing operation can be verified by means of a spectroscopically active additive.
