Clean and sanitize floors, walls, windows, desks, countertops, washrooms, meal rooms, sinks, drinking fountains and other school areas.. Empty and dispose of refuse and replenish supplies.. Lock doors, secure windows and perform building security checks at the end of shifts.. Assess emergency situations and contact appropriate departments or authorities.. Test fire alarms and clear exit doors.. Perform major cleaning operations during school holidays.. Clean custodial equipment and report major repair requirements.. Provide access and equipment for extracurricular activities, night classes and community groups as assigned.. Assist other custodians and perform other custodial or emergent duties.