In this paper, we have presented the results of three different methods that may be used to repair or remove an unsuitable mirror coating. These methods can provide faster turnaround compared with repolishing an optic. The repair method that far surpassed the others in terms of upholding the spectral requirements and LIDT of the optical coating involved the use of ion milling to completely remove the unsuitable coating and then recoating the optic with the desired coating. The disadvantages of ion milling include nonuniform etch rate (depending on your system) and the formation of pits and, hence, increased surface roughness and scattering. Lower ion energies may reduce the incidence of pitting, but this will also decrease the etch rate. Exploring these tradeoffs could be the subject of a future study. Fortunately, the surface imperfections that we observed on the large BK7 mirror that we repaired with ion milling have not been significant enough to cause the optic to not meet its performance requirements, perhaps because the low transmission of the mirror at its 1054 nm, 45 deg P-pol operating point allows little light to reach these surface defects. Nonetheless, the influence of ion milling on substrate modifications such as pitting, roughness, and curvature warrants further investigation. It is for this reason that we still favor optical repolishing, which reliably restores the substrate surface to its original condition. However, when fast turnaround is required, ion milling is an appropriate alternative to repolishing for high reflection coatings such as the ones presented in this study, which are better suited to avoid the performance degradation associated with substrate defects compared to antireflection coatings.