We all need a plumber at some point, and as our homes and plumbing systems age, the Bureau of Labor Statistics estimates that by 2020 there will be 82,300 more plumbing jobs that need to be filled. One of the things we’ll be hiring all those new plumbers for is drain cleaning. Here’s how to tell if you need yours cleaned out. You Have Slow Drains This is the first sign of a problem, and if you have slow drainage you should do something about it right away. If you wait too long, a small problem could easily turn into…