Q tip or tooth brush will help you target it. I did it a year plus ago and didn't lose any in the process. It was just other things that killed them.I thought about trying that but I don’t know how the digi would respond.
My process was manual removal, brush clean, brush with h2o2, rinse, return to tank. Zoa's hated it, lps were somewhat fussy, didn't have sps at the time.