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After the water boils, take the lemon peels out. While swirling constantly, reduce heat and gradually incorporate the grated soap. It may take a while for the soap to completely melt and mix with the water, so be patient.
When the soap has melted, which should take about 20 minutes, add the soap powder and stir until fully dissolved.
Add the sugar a little at a time while stirring constantly to combine.
Add the vinegar and alcohol to the mixture at this point. At this stage, you may feel free to include some color—yellow or green would go well with the zesty lemon motif.
Once the liquid is no longer hot, gently transfer it to a soap mold or other appropriate container. Soap may be cut and molded after about 6 hours of solidifying.
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