I had them in my loft some years ago. This time of year they are up to rumpties for breeding and like somewhere nice, dry and warm to 'do the deed' and bring up the litter. In my case they made a nest out of the insulation.
I tried most of what you are considering and nothing worked blocked up the hole in the eaves where they were getting in destroyed their nest I even put a radio up in the loft hoping the voices would scare them off. Even tuned it to radio 4. Turned out they bloody enjoyed current affairs. Later I got a man with a cage come round and put in the left but they were not interested in that either.
One day I was in the back garden and saw one of them hop over the fence scurry up a tree run along an extended branch (from my neighbours garden) and jump onto my roof.
Later on I went up into the loft and scared them all out. By this time the young were pretty mobile. Went out back got a ladder and sawed off this branch at the fence line. That solved the problem as they had no other way of reaching the ingress point so never came back.
Last I heard they had found a nice cozy shed over the back somewhere....
