[CGASMIA68]

why warm and why soapy

Plain ole 32 degree water will work just fine

[Vigilanteman]

Warm and soapy takes a little more time to soak in, soaks in deeper and gives them time to contemplate.

It is sort of like choosing a groin shot over a head shot.

[Ruy Dias de Bivar]

Soapy water is a wetting agent that goes through the clothes better. It is often used to kill off whole flocks of roosting starlings on a cold night.