How to Clean Toilet Siphon Jets for a Stronger Flush

Underneath the toilet rim, there are siphoned jets with spacing less than an inch wide. These are small holes in the toilet bowl that allow water from the tank to flow down into the bowl when you flush. If not regularly cleaned, over time, the jets get infested with mold, mineral deposits, and accumulation of debris which may result in a weak flush. Because the area is dark and hidden, the dirty jets can also offer a conducive environment for bacteria and fungi to develop.

To clean toilet siphon jets, start by inspecting your jets for signs of dirt using a mirror. Thereafter you can clean using vinegar, bleach solution, detergent, a duct tape and scrubbing brush.

If they are blocked, you will need a thin sharp object like a piece of wire to scrape out the jet holes. Following are the methods with steps plus common cleaner solutions.

Picture of toilet siphon jets
Toilet rim holes

Cleaning with Vinegar

Because you’re cleaning under the toilet rim, you won’t require a lot of supplies. Here’s a list of the materials you will need plus a step by step guide.

Materials Needed

  • Mirror
  • Rubber gloves
  • Cleaning detergent /disinfectant
  • White vinegar in a spray bottle 
  • Brush


  1. Wear gloves then using a mirror inspect your jet holes to determine the amount of dirt.
  2.  Put on a face mask if the scent of vinegar is too strong for you.
  3. Measure a cup of vinegar and bring it to a boil. Allow to cool just a little bit and add it to a spray bottle. In place of vinegar, you can use a bleach solution or a detergent
  4. Bring up the toilet seat and spray the vinegar underneath the rim with special attention on the siphon jets.
  5. Let sit for about an hour to allow the mineral deposits, dirt, and debris to trickle down the loo.
  6. After the one hour, gently scrub under the rim with an Allen wrench brush. Move it around the rim steadily until all the dirt leaves the siphon jets.
  7. Use the mirror to crosscheck for any remaining dirt. In case there is, repeat the steps as needed until the small holes are clean.

If the sediments underneath the rim over the siphon jets have been there for a considerably long time, it may be harder to remove the ring of dirt. You may need to scrub more aggressively or settle for the cleanest version there is.

Duct Tape

First, you simply gather your supplies for the cleanup.

Unblocking toilet siphon jets with duct tape
Duct Tape

Materials Needed

  • Vinegar
  • Bucket
  • Rags
  • Duct tape
  • Brush
  • Mirror


  1. Turn off the water supply to your tank from the main supply line to the bathroom area.
  2. Clean out the toilet by flush it one last time and getting rid of the water in the bowl. This is to give space and freedom to really get under the toilet rim.
  3. Confirm that there’s no water trickling down the water tank in an attempt to fill up for the next flush.
  4. At this point, you have two options. You can thoroughly clean out the bowl first, or initiate the soak then clean afterward.
  5. When the toilet bowl is dry, tape the area under the toilet bowl so that it remains firm on the porcelain under the rim, covering the water jets.
  6. Fill the water tank with vinegar and flush the toilet. This way water will be sealed by the duct tape allowing the rim and the jets to soak in the vinegar for as long as the tape is secured there.
  7. After about an hour to overnight, remove the duct tape to release the vinegar, scrub gently and check to see if the dirt is cleared.
  8. Open the waterline and flush again to allow for clean water to run through the jets.


A delimer is an industrial-strength liquid toilet bowl cleaner specifically formulated to clean and remove lime, rust, scale, and stains. It is a blend of acids among them hydrochloric acid. One of the most popular and top-rated delimer is CLR

Delimer to clean toilet bowl rim jets
CLR Delimer

Some delimers come refreshing scents that leave your toilet smelling awesome. Following is a video showing how to use it.

Blocked or Clogged Siphon Jets

Blocked or clogged siphon jets are a very prevalent problem associated with siphoned toilets. Luckily, there are simple ways to clean out the jets from bacteria and mineral deposits.

Signs of Clogged Jets

  • Toilet does not flush correctly
  • Vertical flow of water from the jet holes-water should flow diagonal in circular direction allow an effective flush cycle.
  • An abnormally long duration for water in the tank to empty into the bowl.
  • Low level water in the bowl

Cleaning the Bacteria around the Siphon Jets

The most essential goal for unclogging the siphon jets is to kill the bacteria causing infections. Hence, when you gather your supplies, make sure you use the strongest detergent and disinfectant for the job.

Materials Needed

  • Bucket or container
  • Rags
  • Soft hand brush/ sandpaper
  • Vinegar
  • Baking soda
  • Disinfectant/ Bleach


  1. Flush down water from the toilet tank to get a clear glimpse of where the ring of bacteria is.
  2. Make a paste in a dish using baking soda and vinegar. Ensure the paste is thick enough to stick under the toilet rim with precision on the siphoned jets.
  3. Apply the paste all around that section.
  4. You can scrub gently with the hand brush to make sure the paste gets into the holes of the siphon jets.
  5. Leave it on for half an hour.
  6. Once back, scrub it again for better results.
  7. Wipe down with a rag and use the mirror to see if you’ve removed all the bacteria under the rim. You may repeat the same procedure if unsatisfied with the results.
  8. Clean up your equipment.

Sometimes the bacteria are inside the siphoned jets and not just on top of it. In this case, you have to look for a tool that can get inside the holes. Something like a wire hanger. Then use this procedure below to clean out the holes.

  1. Empty the toilet bowl so you can easily place the mirror to reflect under the rim, where the jets are.
  2. Unwound the wire hanger and insert into one of the holes.
  3. Gently crank up the wire-like your scraping something off. You may see some sediments fall from the holes.
  4. Move done, apply the bleach or a toilet detergent all around the rim area and let sot for about 15 minutes.
  5. Flush one final time as you scrub with a brush. The bacteria buildup should be removed by now.

Take precautions on the types of chemicals you use while cleaning as some manufacturers recommend particular types of detergents and cleaners.

Deep Cleaning Out Mineral Deposits from Siphons

Getting rid of the mineral deposits undergoes the same procedure but takes more time and more aggression to get results.

This is because the mineral deposits tend to hold onto the porcelain surface much tougher than the ring of bacteria. Delimers would do a good deep cleaning of the siphons. You can also try any of the other methods above with vinegar or the duct tape.

Make the solution and repeat the procedure regularly to achieve results. You could use warm vinegar, added borax, lemons, or bleach. Whatever works best in the situation. Remember to remain gentle so as not to cause any harm to the porcelain material such as cracks that need repairs.

Did you know… a toilet is not dirtiest place in your home? The constant flow of water actually makes cleaner than your kitchen…Unfortunately once that constant flow comes to a halt, chances of bacteria and fungi growth increase. Keep the jets clean…


What is a Toilet Siphon?

Siphon jets are small holes located underneath the rim of your toilet bowl. They allow flow of clean water from the tank into the bowl whenever you flush.

Do all Toilets have Siphon Jets?

No, there are various types of toilets and the siphonic toilet is only but one of the varieties. It’s engineered to release water from the tank through jets that pressure water over the bowl to easily and effectively clear any obstructions. So although the siphoned toilets are the most prevalent type, they aren’t the only ones available. Hence, not all toilets have siphoned jets.

Why is Siphon Jet Bubbling?

A bubbling siphon jet is the first indicator of a constricted or obstructed waterway. The black thing around the toilet rim will cause the bubbles to appear as water has to pass over the ring of dirt to release water to the toilet bowl. If you notice a bubbling water jet, you need to clean up the area down the rim as soon as possible.

Further Reading

One Comment

  1. Thanks for sharing this wonderful article loaded with information. I am a big fan of this post. After reading this I really want to clean under the toilet rim with Vinegar and I will share my experience after using this. Keep on sharing this kind of article with us.

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