Dreams involving birds, especially in a menacing context, can symbolize feelings of anxiety, fear, or a sense of being overwhelmed by outside forces. The huge black circle in the sky may represent a looming threat or an unknown problem that you feel is beyond your control. The black birds attacking people could reflect feelings of vulnerability or perhaps a situation in your life where you feel threatened or attacked by external circumstances or people.

Your reaction of running into the house and locking the door suggests a desire for safety and security. The house often represents the self or personal space, and locking the door indicates a need to protect yourself from perceived dangers. Hearing something in the kitchen may symbolize concerns related to your domestic life or personal issues that you need to address.

The bird trying to get in through the window could represent intrusive thoughts or worries that you feel are trying to invade your personal space. The act of squirting washing up liquid into the bird's mouth and its subsequent death could signify an attempt to eliminate negative influences or thoughts in your life. The white rice-like things that came out may symbolize the consequences of your actions or an unexpected outcome from dealing with these fears.

The transformation of the bird into something see-through and plastic-like might indicate that whatever threat you perceived has lost its power or substance, becoming something less threatening and more manageable.

Overall, this dream may be reflecting your subconscious processing feelings of fear and vulnerability, as well as your efforts to take control of your environment and protect yourself from negative influences. It could be beneficial to explore areas in your waking life where you feel under threat or overwhelmed, and consider ways to address those feelings.