Changes surface tension?

[Externet]

Hi.

My father once told me that in those days of early automobiles with fail-prone windshield wipers, applying a raw potato cut surface to the glass exterior forms a sheet of water allowing decent vision; was a common resource then, and it is confirmed to work well.

What goes on and what chemical from the potato is the acting agent, and equivalent 'modern' chemicals?

Miguel

[iNow]

It's the starch.