Baking soda and vinegar create a visible fizz, but that reaction does not produce enough force to clear most compact clogs. It may loosen light residue or help with odor, while hair, hardened grease, and solid blockages usually need mechanical removal.
Fizzing is not the same as clog-clearing pressure
The reaction releases carbon dioxide and looks vigorous, but most of the gas escapes through the open drain. Do not expect it to push through a dense blockage that already stops water flow.
It may help with light residue and maintenance
In a drain that still flows, appropriately hot water and physical cleaning of the stopper or strainer usually accomplish more. Baking soda and vinegar can accompany light maintenance but do not replace removing trapped material.
Hair and solid objects need removal
Hair in a shower or sink, debris in a trap, and solid objects respond better to tools designed to remove them. Repeatedly pouring products down the drain can delay the fix and complicate later disassembly.
Do not combine it with chemical drain cleaners
If a commercial drain cleaner has already been used, do not add vinegar, bleach, or other products unless the label specifically permits it. Chemical mixtures can generate heat, splashing, or dangerous fumes.