4 the Birds can be removed with mineral spirits and a putty knife. Scrape off the thick part of the gel with a putty knife and then use mineral spirits to get off any remaining gel.
4 The Birds - Bird Repellent Gel cannot be used in exposed areas where the woodpeckers would be pecking, so it is not usually recommended for them.
Most of the time woodpeckers are attacking your home because it is finding food under your siding, or insects. (Woodpeckers make noise on trees or homes to communicate with each other.) Sometimes applying a liquid insecticide, like Talstar P in the area where the bird is doing damage, will kill any pests behind the siding and therefore if there is no more food, the bird will go elsewhere. The bird could also be targeting the area for nesting material. You can try other non-spraying methods by placing reflective tape in the area or a fake owl or other bird of prey to deter the woodpecker.
You could potentially use 4 The Birds - Bird Repellent Gel on stucco and other surfaces; however, keep in mind that this should be used on ledges, sills, roofs, and similar areas.. The application surface needs to be completely cleaned of dust, dirt, droppings, and other loose debris before applying the 4 The Birds gel. Porous surfaces should be sealed prior to treatment using shellac or a white glue solution. You would use mineral spirits to remove old applications of 4 The Birds - Bird Repellent Gel.
The label only specifies that smaller birds may become fatally entrapped by 4 the Birds. You want to be sure to only apply as directed on the label so it is not over applied.