The endoscope has an elongated insertion portion, an operation portion provided at the rear end of the insertion portion, and a contact-less endoscope exterior body in which no electrical contact is exposed on the outer surface thereof including the insertion portion and the operation portion. One feature reduces all unessential processing as the amount of available storage decreases to a point low enough to threaten a system abend. The preferred amount of the two zeolites may range from 10 to 90 wt % of the total catalyst amount in the final dried and calcined form, preferably the zeolites are in equal parts by weight.