I have a slow-draining bathtub. I tried disconnecting the drain screen and cleaning the drain with baking soda and vinegar, followed by boiling hot water. This has worked in the past but worked only a little this time. I suspect I need to clean the trap in the drain.
How do I do this? I've never done this before, and assume it's not a huge deal, but just want to be sure I do it correctly. Do I need a plumber's snake, for instance?
Here is how our trap looks: