White Pigeons/Doves


I am hoping someone can offer some advice on white pigeons or doves.  

We moved into our house a year ago and had two white pigeons nesting on a drain pipe under the roof soffit, following a hole opening in the roof they moved into the loft and then rapidly bread and are now 8! 

We fixed the roof and now they are living on our window ledges, they sleep on the ledges and are creating a lot of mess down the walls and by our front door.

We have tried to build them a Dovecote and since put spikes up on the ledges but they are still sleeping on there, resting on the spikes which looks very uncomfortable but they seem desperate to stay here! We don’t mind them being around as they are beautiful but don’t want them on the house.  

Does anyone have any advice on how we can relocate them?