The addition of detergent to water will break the surface tension and this would make the water strider sink into the water.
The surface tension of water is broken by the addition of detergents or surfactants.
With surface tension, the water strider is able to walk on water.
With surface tension broken as a result of the addition of detergents or surfactants, water striders will not be able to work on water. Instead, the insect will sink into such waters.
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