STEP BY STEP INSTRUCTIONS: 

ON HOW TO CLEAN A BLACKBOARD PROPERLY

1. Rub the whole chalkboard with clean erasers in order to remove the large amounts of chalk dust.

• Beat erasers, vacuum them, or rub them with a cloth to make sure that they are clean before you begin erasing.
• Move a clean eraser either horizontally or vertically as you move across the chalkboard, changing to a clean eraser when the one you are using becomes too full of dust.

2. Wipe the whole chalkboard with clean white cloths in order to remove as much excess chalk dust as possible.

• Move a cloth either horizontally or vertically as you move across the chalkboard, changing to a clean cloth when the one you are using becomes too full of dust.

3. Mix warm water and 1/2 cup (120 ml) vinegar in a bucket

4. Soak some clean white cloths in the solution in the bucket.

5. Wring out a cloth from the water-vinegar solution bucket, and use it to swab the whole chalkboard.

• Wipe with one of the wet cloths beginning at the top left corner and moving in a single horizontal stripe across to the top right corner.
• Refold the cloth so that a clean portion is available.
• Move down just below the top stripe and wipe back across the chalkboard from the right side to the left. Continue with these stripes all the way down to the bottom of the chalkboard. Change to a new cloth when the current cloth gets too full of chalk dust. http://www.wikihow.com/Clean-a-Chalkboard