Good plumbers are going to have a valid license that you can check on. Look up the number they give you online and see trustworthy drain leak repair if it is valid and if any complaints have been filed against that number. This will tell you if they are at least good and have not done anyone anything wrong. Some of the best plumbers are going to know and understand the local building codes and will be able to explain to you what is needed for the job to be in code.
If you ask and don't receive a copy of worker's compensation and liability insurance, don't use the builder. You may even go as far as to call the agent listed to verify that their insurance is in force. Finally, remember worker's compensation protects people. Liability protects property. You need to have both.
It is even possible for you to carry out a home toilet repair. Information is readily available in the Internet showing you how to carry out a variety of simple repairs. A toilet which is running can waste local water heater repair service, leading to higher bills, so the job is best tackled as quickly as possible. A leaking toilet can obviously cause damage to other fixtures and fittings in the bathroom, and a clogged toilet is a great inconvenience. All of these are jobs which you can tackle yourself.
That is why it is good to use a less caustic combination of baking soda and vinegar instead of a harsh liquid drain cleaner. If there is standing water in the sink try to remove as much of it as possible. Then pour about 1/2 cup of baking soda into the drain followed by 1/2 cup of vinegar. When these two react together they will create a foaming action that will loosen many clogs.
Last but not least is don't hire someone just because they gave you the lowest bid. Next don't hire some handyman that does odd drain line repair jobs, in some cases they can cause you more problems that down the road it will cost you more money to fix what these handyman broke or did wrong. Sometimes the lowest bid is going to cut corners and not do the job right or when they get there and start doing the work, they keep saying they are finding more and more wrong and you end up spending more than what you should have.
Glycol (Ethylene glycol) is the most common automotive anti-freeze but it requires safe handling. Ethylene glycol is a toxic substance that can cause death if ingested. It also pollutes the environment and should never be dumped in sewers or storm drains. Propylene glycol is a relatively recent alternative to ethylene glycol. It's less toxic but it's still a hazard and should be handled with care. In particular, keep both chemicals away from pets and children. Always dispose according to your local hazardous waste regulations. Don't pollute!
By now, you should be more than aware of what to look for when hiring a plumber. Keep in mind that all of the other things we have discussed are just as important as price is. Also keep in mind how easy it is to hit the web and see a variety of reviews for most local companies you could ever wish to hire. Do not forget to hire only certified companies as well.