I guess the headmaster of Drummoyne Public School must be asleep, since there has been graffiti sprayed around the external wall for a few months now. I tried contacting the school when I first noticed it, but that came to nothing. I'll give it another go this week, but given that school holidays have just started, I presume no one will be very keen about putting in the effort to get it cleaned up.
Even a garage across the road from the school has been hit.
Yes, these signs are the responsibility of the RTA, but if the school has a computer with an internet connection, they can log a job with the RTA in 2 or 3 minutes and request that they come out and clean these signs. (I've found that you can clean this stuff off in seconds with a rag and a bit of metho).