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How do I remove the corrosion from the charging pins of my FREEDOM7 / SCUBA7Updated a month ago

Make a paste of vinegar and salt. Apply paste to the rusty pins, leave a few minutes. Speed up the chemical process using a brush/ toothbrush dipped in the Vinegar and salt paste. 

Rinse off with water. Now make a paste using baking soda and water. Apply and leave for a while, can also a brush, again dipped in the baking soda mixture to speed up process.

Rinse well with water. Final result - corrosion completely removed.  

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