Pigeon guard services are only successful when you have two things, 

1. the right type of wire

2. installed correctly. 

the later matters the most and its important to have the guard installed right. 

Like anything in construction, you can have the best material but if the install is bad, it will inevitable fail. 

To ensure that homeowners that are DYI'ers get it done correctly, I do offer services to teach the proper installation method. I offer ladder rental as well. just ask for it when you call or text.