The invention relates to a disinfection method to be used for cleaning. The invention is characterized in that hydrogen peroxide (H2O2) is drained/transferred from one or more tanks (16) by a liquid pressure created by one or more pumps or gravity through one or more draining pipes (6) to one or more draining devices (5), which draining device (5) drains hydrogen peroxide to one or more onto one or more evaporation top surfaces (4ea) of an evaporation member (4e) of a warming/heating device (4), the evaporation top surface (4ea) is at an evaporation angle (4ej) of 1 to 30 degrees so that the end on the draining device (5) side is higher, whereby hydrogen peroxide spreads due to gravity on the evaporation member (4e), where the hydrogen peroxide (H202) turns into hydrogen peroxide gas, with which hydrogen peroxide gas the disinfection is performed, the devices of the disinfection method are located in a disinfection device body (1) which disinfection device body (1) is a device of a standard size and shape, equipped with standard connections, whereby the power of the disinfection method may be selected as desired by placing the desired number of disinfection device bodies (1) in one disinfection device. The invention further relates to a disinfection device, to be used for cleaning. The invention further relates to a disinfection device to be used for cleaning.L'invention concerne un procédé de désinfection destiné à être utilisé pour le nettoyage. L'invention est caractérisée en ce que du peroxyde d'hydrogène (H2O2) est drainé/transféré d'un ou plusieurs réservoirs (16) par une pression de liquide créée par une ou plusieurs pompes ou par gravité à travers un ou plusieurs tuyaux de drainage (6) vers un ou plusieurs dispositifs de drainage (5), ledit dispositif de drainage (5) drainant le peroxyde d'hydrogène sur une ou plusieurs surfaces supérieures d'évaporation (4ea) d'un élément d'évaporation (4e) d'un dispositif de réchauffage/chauffage (4), la surface supérieure
