BLACK-BOARD OUTLINE

The black-board scheme, as the lesson develops, will appear as follows:

1. Meaning of Cleaning:

Cleaning is removing any foreign substance.

2. Methods of Cleaning:

(1) Scraping or rubbing away the foreign substance.

(2) Dissolving the foreign substance and then scraping or rubbing it away.

3. Household cleansing agents used in the first method:

(1) Duster(6) Whiting
(2) Brush(7) Bathbrick
(3) Broom(8) Coarse salt
(4) Washboard (9) Sand
(5) Knife(10) Ashes.

4. Household cleansing agents used in the second method: