Originally Posted by
Kopsis
Ever see what they do to the bikes after the race? Headsets, BBs, and wheel bearings are removed, inspected, and regreased. Chains are cleaned and lubed after every race (and still seldom last more than a season). The pressure washers are used because they're expedient and the side effects will be corrected after the race -- not because they're particularly good for the bike.
This. You beat me to it. Thank you.