Water jackets

[Gt6steve@AOL.COM]

Greetings all, Does anyone have experience or opinions on acid washing 
cylinder head water jackets to remove accumulated rust.  I recently sectioned 
a cracked Triumph head to study the internals and was pretty amazed at the 
crap inside it.  I've thought of fabricating manifolds and pumping some 
caustic through or simply immersing an entire head in something to try to 
eliminate these sediments.  Any thoughts?  TIA, Steve