This balcony was being used as a nest site by pigeons, they were also perching on the hand rail

looking for food from the shopping area below.  It was not possible to net the balcony, spikes are not an option,

so we used Bird Free gel pots, non-toxic, and they worked straight away :)

The balcony can now be used and is clean and safe, from below the deterrent measures cannot be seen.