Removing Corrosion

What's in the tank now, Mildred, and why is there a perceived need to clean it?

Muratic acid. Just give a good rinse with water. I have even used vinegar on Cs plates, problem is the plates come out smelling like pickles.

"... The usual methods for rust removal from carbon steel include abrasive blasting (wet or dry), brushing, acid pickling, salt bath descaling, alkaline descaling, and acid cleaning. The selection of the rust removal method depends on many factors as well including the thickness of rust, the composition of the metal, allowable metal loss, surface finish tolerances, available equipment, and cost. If moist air is the cause of your problem, you might consider purging the tanks with dry nitrogen and using a nitrogen conservation vent. This will permit the tanks to "breathe" while preventing the ingress of moist air. If you are trying to detect small rust deposits, the easiest NDT test may be visual testing. This can be done by the naked eye via periodic internal inspections of the pressure vessels themselves or with the aid of cameras, borescopes, etc. If significant areas of rust are constantly being formed and flaking off, ultrasonic thickness testing may be useful."

http://www.chemicalprocessing.com/experts/corrosion/show/524/

I'd stay anonymous - and don't answer any questions.

Wire brush!

Not enough information to make any other comment!

You can try high pressure water jet pumps specially made for tank cleaning.

i think, water jet is not correct ,it gives more corrosion . water jet cant remove crrosion also