The problem is that this area is just above the door way and as the pigeon feces builds up it rolls down the tiles onto the walkway below, creating slip and fall hazards and can also get into the air you breath.

Exclusion net, screen or shock systems of the tile areas is the best solution to this problem. Spike in an area like this will allow the birds a good nest site, since they can walk up to the spike and drop twiggs into the spike and build up the area for a nesting site.

 They begin building the nest in the spring and prefer locations where mosquitoes, flies and beetles are in good supply.

Cliff Swallows like to attach their mud nests to the underside of eaves, one of  the best way to stop them is to net off the area to break up the angle.

 It breaks up the angle and doesn't allow the Cliff Swallows to nest, this product is also good for tops of pillars in keeping pigeons off.

Gels are designed to make pigeons feel uncomfortable when they stand on the gel and this will make them move away - Yes & No

Most gels are petroleum base products and will dry out after a period of time depending on climate extremes, Southwest about 3-6 months. When the gel dries out it turns black and leave a sticky mess that attracts feather, dust, feces and sometime small song birds, but at this point it doesn't keep pigeons away it just looks bad.

Make sure that your eaves and vents are closed so as not to allow birds into your attic. Pigeon feces, feathers can get into you air duct system and cause health problems for you and your family.

 Pest birds can harbor over 40 types of parasites, & host internally 60 types of infectious diseases