Memo to whoever owns this building on the Scarth Street Mall. If you want to reduce the amount of pigeon excrement on your canopy you might consider removing the banner that’s been hanging there for a couple of years now.
In colder weather during the day, and year-round at night, pigeons use it as a handy area to shelter behind. If the banner wasn’t there, I suspect it would substantially reduce the amount of time pigeons spent hanging out on the little ledge above the canopy and defending their turf from other pigeons.
Failing that, you might want to step up your maintenance program on the canopy because at present it’s kind of gross.