I use goo-b-gone gel formula....works great. I remove with system with 90% alcohol and mirror slide it, then put the system in a bowl, with the edges down in the bowl and the center poking upward and then pour about half a bottle of the goo-b-gone gel into it and let it sit for about 20 minutes while i clean the glue off my head and shave it. then i squeeze the goo-b-gone out and wash it with shampoo. roll it in a towel to dry then give it a final mirror slide to get all extra residue. This is when all the bits of glue come out of the holes. Gets it clean as new. Then re-attach. Total time 30 minutes.