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Rinse the seeds in a colander with cool water.
Place a colander into a sink and dump all your seeds into it. Run cool water over the colander and move it around in a circle so that it covers all of the seeds. Afterward, place the colander down and mix the seeds around with your hands as the tap runs to expose their entire surface to water. Remove any excess pumpkin flesh that you find stuck to the seeds. Don't worry if the seeds feel slimythis doesn't mean they aren't clean!