Bird-X bird spikes are effective!
A 5/5 star customer product review
For something so simple, they are definitely effective. I used them on a metal arbor. I hung two upside-down tomato planters from the arbor and had a bench underneath, but found the birds using the arbor as a toilet – not real healthy for the tomato plants and not a pleasant place to sit and enjoy the garden! I attached the plastic “spikes” to the arbor and no more birds. The glue has held up well – somewhat messy in applying, but not a huge problem. Was able to cut the spikes to fit.
By ‘cKenna’ from Illinois