Homebrew PCBs

Hey, has anyone tried using automotive windshield-wiper fluid pumps to 
spray etchant? In particular, HCl/H2O2 etchant?

Or maybe taken any apart to see if the fluid path is all-plastic? (no 
pesky metal to dissolve?)

Alternatively, is there a suitable small pump available for under say, 
$40? I wouldn't need all that much volume/minute, and just enough 
pressure to get a nozzle to spray reasonably well.

-Gary