Soap is a washing product, which has the functions of decontamination, cleaning and sterilization. Through surfactants and alkaline components, dirt and grease can be effectively removed. According to the topic, decontamination is the most effective, and the obvious answer is soap.

Riddle is the main part of riddle, and it is an explanatory text that expresses and depicts the image, nature, function and other characteristics in the form of argot for people to guess. It is a clue to reveal the conditions given by the answer, a part of the artistic expression of the riddle, and also a part of the riddle question. It usually consists of exquisite and vivid poems, epigrams, phrases, words and characters. The words on the riddle should be concise and easy to understand.

Solution to puzzles

Subtraction: Subtract related words or radicals and strokes from riddles or answers according to the hints of derogatory words in riddles or answers, and then lock the face and bottom together.

Half-face method: also known as "half-face" puzzle. By extracting half of the Chinese characters on the puzzle and then putting them together, most puzzles have the word "half".

Directional method: according to the southeast, northwest, up, down, left and right, inner and outer angles and other directions, the relevant words, radicals or strokes are processed accordingly and decorated as the bottom.

Interlacing method: the stroke position of Chinese characters is used to change without increasing the loss, so as to achieve the purpose of interlacing each other.

Shift method: according to the modification relationship of the puzzle, the strokes of Chinese characters are moved to form a puzzle.