The idea is to drain the water completely,
add food coloring to a bottle
of vodka (so we can see it), and run
it through the system to penetrate
any spots where water remains.
Then blow it clear. Whatever vodka
remains, evaporates. Since it leaves
no trace, there is no aftertaste next
season. A bottle of vodka costs more
than a minus-100-degree bottle of
pink antifreeze, but the benefits far
outweigh the $10 to $15 more in cost.