In this study, the measurement of two-dimensional voltage distribution on tribocharged dielectric polymers was conducted with a high-resolution electrostatic voltmeter in cleanroom environments. The distribution was very nonuniform. This measurement technique was applied to evaluate the performance of .charge-removal methods for the dielectrics. The ionizer had difficulty in neutralizing surface charges distributed in the form of mosaics of mixed negative and positive charges. On the other hand, IPA-dipping had drastic charge-removal effects not only to reduce their mean voltage but also to render their voltage distribution uniform.