It is easier to spray water to which soap is added because the addition of soap to water:

Why do colours and lubricating oil have less surface tension?

It is easy to wash clothes in hot water because its

$A$ small spherical droplet of density $d$ is floating exactly half immersed in a liquid of density $\rho$ and surface tension $T$. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet).

Why does the free surface of a liquid tend to contract?

An iron needle slowly placed on the surface of water floats because