Yesterday finished assembly and this morning was the final passivation.
Early in the process we do a hard passivation with Nitric Acid, but at this point it is a special Citric acid solution that cleans and passivates.
Because it is a much less acidic solution, this one can be applied with a squirt bottle, and it tends to cling and stick to the metal.
We let it sit and do its chemical magic with the Stainless Steel, and then Rinse like crazy. After a few trials, we figured out that a regular garden hose just did not give the rinse we wanted without taking a very long time, so the last few have been power washes like the one this morning.