Battery acid and cleaning it off.

[vicars]

How do you clean battery acid from the inside of a metal torch?  Many thanks in advance and have a nice day!

[Clanad]

By torch, I think you mean a flashlight, as we call it here in the U.S.  You can either use water and baking soda as a paste which will neutralize the acid or use car battery terminal cleaner in the spray can.  If you have hard acid scale on the side this will let you use a big long screwdriver to scrape it off.    Then after it is all clean, spray some battery neutralizer from a can available at an automotive shop.  The one to use is red in color, to stop the acid coming back. (Source: MagLite Fixer)

[Gef]

Just wondering how it got there in the first place.

[Clanad]

Gef,  it's from the batteries leaking, especially when they become almost totally discharged.  Here, the deffinition of a flashlight is a metal tube used to store totally dead batteries...