Vinegar and baking powder for clogged drain?

I am not an expert, but my grandmother uses baking soda and vinegar to clean her drains, so I imagine it is good to use (She is 93 and knows every helpful house tip there is). She puts a couple tablespoons of baking soda down the drain, then pours some vinegar down. After a few minutes, she runs really hot water down the drain to rinse everything clean. Not only does this clean the drain, but it also gets rid of bad odors. Make sure you use white distilled vinegar.