This is a product review but I'm not getting anything to do it.....just passing along some info.
Our upstairs bathroom sink has had a slow drain to it. Like when you brush your teeth the water would build up and take awhile to go down.
I tried baking soda and vinegar and that worked for a bit but it would always go back to being slow again.
I tried the Draino stuff and that did nothing.
Last week I bought this Foaming Snake stuff by Liquid Plumber and it worked great! Haven't had any problems since. So if you ever have a slow drain make sure to try this!
(just saw the commercial which reminded me to pass on the good product review)