Can the washer fluid line (under firewall to hood) be encased in flexible conduit for protection?

Chipmunks have now twice eaten the washer hose just around Y connection to sprayer ports.  This is located between firewall cover and bottom of hood.  Fluid everywhere has molded the firewall panel which needs replaced - again - along with hose line.  Can those washer lines be covered with a hard flexible conduit to protect from these critters?  I can't take off work every couple months and spend $300 to repair/replace these items.  Second time in two months this has happened.  Firewall insulation cover gets saturated and covered in black mold quickly - I have asthma so makes it hard to drive my own car when this happens.