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We describe a technique, called polarization difference maps (PDMs), that fully reveals ferroelectric switching of regions within individual grains. Using PDMs, domains that have undergone 90° and 180° switching were mapped for a 100 nm thick polycrystalline lead zirconate titanate (PZT) thin film. Almost half of the scanned regions were found to undergo 90° switching during the applied electric field reversal. Some 180° switched domains clearly went through two successive 90° switching.