The correct passive form of the given sentence is:

☀ Soap is not used by me.

Let's break down the options:

1. Soap did not use by me. (Incorrect) This sentence is not in the passive voice. It is in the active voice, but the word order and grammar are incorrect. The correct passive form should be "Soap was not used by me."

2. Soap has not been used by me. (Correct) This sentence correctly uses the passive voice and conveys the same meaning as the original sentence, indicating that "soap" is not the subject performing the action but rather the object that "I" do not use.

3. Soap was not used by me. (Incorrect) This option is almost correct, but it is in the past tense ("was") instead of the present tense ("is"), which changes the meaning slightly. The original sentence is in the present tense, indicating a general habit or behavior, whereas this option suggests that "soap" was not used in the past.

4. Soap is not used by me. (Incorrect) This option is in the active voice, not the passive voice. It is the same as the original sentence, but we need to transform it into the passive voice as requested.