Seeing much white dust developed around my car battery so I decided to clean it up. Items that I used.

1. Sodium Bicarbonate. You can get this from supermarket (baking section)
2. Waxco Silicone Spray (optional). This product will prevent white dust from further corroding your metal parts (this is because the spray will act as a film against the white dust & metal and you can get this from your local hardware store. (Mr. DIY etc)
3. old towel.
4. Water

Steps

1. Mix a spoonful of sodium bicarbonate & water inside a bottle (shake well until all the sodium bicarbonate dissolved).
2. Make sure your car engine is OFF. (No need to disconnect battery wire)
3. Pour the sodium bicarbonate solution on the white dust. (You will hear some hissing sound which is normal as the acidic white dust react with the sodium bicarbonate)
4. Repeat step 3 as necessary until all white dust is cleared.
5. now pour some water over the battery to rinse and use the old towel to dry the battery.
6. Spray Waxco silicone spray on to the battery terminal and any area previously plagued by white dust. (Make sure no open flame nearby as the spray is highly flammable).
7. After sprayed with silicone, let it dry for 2 mins.
8. You can now start your engine and good to go.