how gutter remedy works
What is the effect of Surface Tension? Surface Tension is the property
of water that can cause it to behave almost magnetically and cling
to a surface. If you have ever seen a penny float in water, that is
surface tension hard at work.
Sufactants or "self acting agents" can change how surface tension responds. For example detergents, paints, inks are all sufactants. So it's not just about design but also the materials that are used.
The picture of water running around the glass is also an example of how Gutter Remedy "draws" the water into the gutter.