Joe,
I've punched a lot of chiller and condenser tubes but never anything that
small.

I've also acid cleaned copper tubes on water-water exchangers.

I've also cleaned exchangers using either a mixture of Phosphoric and
Hydrofluoric acids OR something like Ellen suggested such as a Nu-Calgon
product called Alka-Bright, which is just sodium hydroxide.

You don't mention what the build up is but it could make a difference. Might
want to contact a plumbing supply house and ask. Be careful though, I've
allowed the acids to contact the metal too long and burned a hole right
through. That sucks.

Hey Thom, I'll bet you had your Levittown domestic coil acid cleaned!

Scout


"Joe" wrote in message
oups.com...
Hey Ol Thom I'm reconditioning some heat exchangers and someone
suggested soaking the tubestack in muratic acid to clean them
perfectly, they are all copper and solder and stainless on a oil heat
exchanger. Is that the way to go?

Joe