[Dottore]

So my old folks live in a high-rise apartment, and the apartment above theirs has some pipes under the balcony on which pigeons love to roost and crap all over my old folks balcony.

Anyone have any suggestions for persuading them to roost elsewhere? I've seen buildings that have these spiky metal strips on the window ledge to prevent pigeons roosting there. Anyone know where to get these?

Any suggestions much appreciated.