It's not corrosion, it's oxidisation. -Clean it off with a good metal polish such as Dura-Glit.
Best is a wire brush and baking soda. You can use grease to coat the terminals to slow down the corrosion.
Clean corrosion off contacts with fine steel woll, sandpaper, etc.
Clean the module edge connectors with a soft cloth or contact cleaner. Blow or vacuum dust from the memory sockets. Also, to prevent corrosion in the connectors inside the memory slots is by matching tin leads to tin connectors and gold leads to gold connectors to prevent a chemical reaction between the two metals, which can cause corrosion.
Clean it with a mixture of baking soda and water.
To effectively clean corrosion off copper surfaces, you can create a mixture of equal parts vinegar and salt, then gently scrub the affected areas with a soft cloth or brush. Rinse the surface with water and dry thoroughly. Another option is to use a commercial copper cleaner following the manufacturer's instructions.
Corrosion from the sulfuric acid. The electrolyte (water) inside the battery is a mixture of sulfuric acid and water. Those blue crystals is just corrosion. You need to clean it off. Remove the negative black (-) cable first and then the positive red (+) cable. With a mixture of 25% baking soda and water, clean all this corrosion off the battery and the cables. You can also use vinegar. Dry everything off and then clean the connections with a battery post wire brush you can buy at any parts store. Reconnect the battery cable positive first then negative.
I often tear off a small amount of plastic scouring pad, the type used in your kitchen to clean the pans, then I work that around inside the socket until the contacts are relatively free from rust and corrosion. After it's clean use an automotive dielectric grease to protect the socket from further corrosion.
To clean corrosion off a copper Indian penny, you can soak the coin in a solution of vinegar and salt for a few hours. Gently scrub the coin with a soft-bristled brush or cloth to remove any remaining corrosion. Be careful not to scrub too hard as this can damage the coin's surface.
Detach the shower heads first and, if it's possible, remove the cover off the shower heads. Scrub the corrosion off the shower heads by using a scrubbing pad. Use oil or lubricant if there are corrosion that are hard to remove. After removing the corrosion, soak the shower heads in a bowl of white vinegar. Let it soak for a few minutes and scrub the shower heads again using small brush or unused toothbrush. After that, let it soak again for a few minutes and rinse it properly.
I tried a 5% solution of household vinegar and although there was some chemical reation and a slight reduction in the white chalky covering of the metal, it did not do the whole job to my satisfaction. Try a stronger solution of 40% vinegar which you can find at Amazon or at any organic gardening supply outlet. It works great as an organic fertilizer and a bug killer as well.
It can block the charge from the battery to the system if there is to much. The corrosion gets between the terminals and the power won't go through. If you have corrosion on your terminals you need to clean them.