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How to organize the area under your sink
Pull everything out of the cupboard.
Pull everything out that you currently store under your kitchen sink. Take stock of everything you currently store there and move it away from the area, so that you have room to clean.
Clean inside the cupboard with disinfecting spray and a washcloth. Spray a disinfecting mixture all over the walls and floor of the cupboard, making sure to get in the top corners.