by orphanespresso on Mon Nov 17, 2008 5:00 am
I have had some experiences with citric lately and would generally recommend fairly short exposures if you are at all concentrated. Mhoy's tablespoon per boiler is about right if you are going to heat cycle with citric. I wouldn't leave it in the machine for no more than 2 or 3 hours as it really does attack brass and at 2 hours you can empty and flush, see how the sight glass looks and decide if you want a repeat. If you soak the external parts in citric too long you can lose some chrome, particularly if the chrome is thin from some previous owner scrubbing with some abrasive....don't ask me how I know.
Again, I would say, fairly dilute with repeats rather than a strong blast all at once.