I can't think of my drains. I must say i do not think a lot of people accomplish that either. Generally, I think the sole time people consider their drains happens when they start having troubles. Quite often, this means that the drains are clogged. Determined by which drain and the kind of clog, I may manage to repair it. However, whether it is serious or one with the major drains mounted on my house, however could consider looking in a drain clearing service.
For minor clogs in indoor drains, I know in regards to the old standbys like vinegar, lemon juice, etc. They are all okay for small clogs in small drains such as the one in the bathroom or even the one out of living rooms. Major clogs like matted hair or thick soap scum, something stuck deep from the pipes, and even difficulty with an attached external drain are not going to be solved with one of these household methods.
This is where I might investigate the professional clearing services. They've techs with long snakes as well as the safe chemicals to have stuff moving again. In certain serious clogs, they may have to dig down where the pipe is usually to take it off, but many of them can make it happen without making a mess. I suggest people begin using these services as an alternative to destroying their piping wanting to cut costs and doing the work themselves.