In the case of seeing a drainer in dreams, the meaning can be extended to signify the removal of negative emotions. This can symbolize removing guilt and shame from one’s self so as to avoid feeling guilty or ashamed about a certain event from happening again. It could also denote staying away from negative experiences or people in general so as to avoid suffering from emotional fatigue or draining yourself emotionally without knowing it.
If a dream includes a drainer in it, the dream is likely to be about cleaning up your life. Perhaps the dream is about cleaning out your emotions and re-evaluating what you want to keep and what you need to rid of. You might also be dreaming about cleaning out negative aspects of yourself or just finding who you are.
Dreams about drainers serve as a reminder for who we are and what we have to work on in our lives. They can also be an avenue for self-exploration when they point out the character flaws of your self-image.