Sometimes when you left an obvious stain on the clothes, simply dropping it in the washing machine can't remove it perfectly. Many people do a manual pre-wash by scrubbing the stain part with some particular detergent. But this is not very convenient.
So the design problem is, how to remove the particular stain perfectly using laundry machine without a manual pre-wash?
For example, we can signal the stain parts with some detergent chips, with the corresponding detergent that can efficiently remove the particular stain. Then add an extra pre-wash cycle to the laundry machine, scrubbing the stain parts hard, followed by the regular washing cycle. So the stain parts are washed twice and removed perfectly, while the other parts are washed only once without too much energy cost.
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