Nancy Flanagan, the 1993 Michigan Teacher of the Year, writes the Teacher in a Strange Land blog for Education Week. She recently posted her own list of 10 tips for teachers returning to classrooms. They're all worth a read, but Number 5 deserves special mention:
#5) Most important people to get on your side first: custodians. Make cleaning up at the end of the day a habit for students and yourself--out of genuine respect for custodians and their work. Keep your room tidy, and extend honest friendliness to cleaning staff. It's good karma--and it means the custodian will hustle to your room when someone throws up.