While a professional can always help, there are some common plumbing culprits you can check yourself to see if you can find the sewer gas smell. For example, you should check your water traps, sometimes called P-traps and S-traps, which are located under sink, shower, and laundry drains. The wax ring beneath the base of your toilet, which creates a watertight seal with the plumbing, could also have gone bad.

There are a few things you can look out for that indicate it’s time to clean your dryer vent, including the following:

• It has been a year or more since the last professional cleaning.

• Your clothes are taking longer to dry than usual.

• Your clothes smell musty or burnt when they come out of the dryer.

• You see lint building up around the outside dryer vent cap.

• Your laundry room is unusually hot.

• Your dryer is unusually hot to the touch during operation.

• You notice a kink in or damage to the vent.

Yes, dryer vent cleaning is absolutely worth the money. The service is relatively inexpensive and quick, and the value and peace of mind you get for the investment make it worthwhile. A clogged dryer vent is a significant fire risk, so the average $140 you might pay to have your dryer vent cleaned once a year could save you thousands of dollars in home repairs if the clog causes a fire. Additionally, some homeowner’s insurance companies will charge you a lower premium if you provide receipts of annual dryer vent cleanings by a professional.

As a general rule, you should have your dryer vent professionally cleaned at least once a year to remove lint and debris buildup, which can cause fires and increase energy costs. However, the frequency may need to be adjusted based on usage. If you have a large household, use the dryer frequently, have pets, or have an older vent system, it is better to clean the vent more often, such as every six months or even quarterly. You should also schedule a cleaning immediately if you notice signs of a blockage, such as clothes taking longer to dry, the dryer feeling hot to the touch, or an odd odor. Routine vacuuming is not a substitute for a thorough, professional cleaning.