Dreams involving strong smells, like insecticide, can symbolize a need for cleansing or protection from negative influences in your waking life. Insecticides are used to eliminate pests, which might suggest that you are trying to rid yourself of toxic relationships, thoughts, or situations.

Seeing someone you haven't seen in a long time can represent unresolved feelings or memories associated with that person. It may indicate that you are reflecting on past experiences or that this person is symbolically connected to the issues you are currently facing.

Together, this dream might indicate that you are processing feelings about a past relationship or situation that you feel needs to be addressed or "cleansed" in order to move forward. Consider what this person represents to you and if there are any lingering issues or feelings that need your attention.

Take some time to reflect on your current relationships and any negativity that may need to be eliminated from your life.