Answer: -I recommend Plumbline Services ( www.plumblineservices.com ). For a flat fee, they will give you a quote on how much the service will cost. I haven't used them, but they are on Tom Martino's recommended list. I have used Marta Mechanical ( http://www.american-plumber.com/profile/heat/CO/Boulder/592 ) in the past, but I'm guessing they might be a bit more expensive. They provide a good service. Whoever you use, ask them about regularly using enzymes to maintain the general health of your pipes. -Plungers work well. If it is a sink, pull out the drain - lots of times there is a bunch of yucky junk around where it connects to the lever that pulls it up and down. Replacing pipes is not a real hard job either, but it isn't always necessary.