Starsan is an example of sanitizers that can be used to sanitize clean surfaces, IE kill bacteria.
Starsan is a no rinse sanitizer and in fact the sanitizing action stops when the product dries.
Yeast is a microscopic creature similar to bacteria
Why is Yeast not killed by sanitizer? Or is the starsan so diluted by the (wort, beer) that it is not longer dangerous to Yeast (and Bacteria?)