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Old 09-20-2015, 01:56 PM   #11
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If the trap can be removed, take it off & clean it or replace it.

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Old 09-20-2015, 02:04 PM   #12
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Or pour a little bleach in each drain...will kill anything "growing".

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Old 09-20-2015, 08:33 PM   #13
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Hello, just had the same problem...my problem was a defective "anti syphon" valve, located by the p trap, under the bathroom sink. Easy fix once the problem was found.
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Old 09-20-2015, 08:53 PM   #14
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I routinely leave my gray water valve open when camping. I discovered years ago that dumping my daily coffee grounds down the sink drain helps to eliminate tank odors.
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Old 09-21-2015, 08:44 AM   #15
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Originally Posted by SmokerBill View Post
I had stinky sink drains and finally removed the traps and cleaned them- they had some nasty stuff growing in them. Seemed to help with the smell.
I am going to go with this one. You can get bacteria growth in a bathroom sink from teeth brushing and lack of water flow through the P-trap. It's a gently used sink and one that can grow slime over time. Bleach will do some to help, but it's best to remove, clean and then bleach it to get to the walls of the trap otherwise the slime stays and returns the smell quickly.

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Old 09-21-2015, 10:34 AM   #16
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Get a little plastic tool called a "zippy" in the plumbing dept of most any big box store.
Just push it down the drain and pull it up while running hot water.
Yuch, surprise! We keep one in our camper and at home. Less than 4 bucks.
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Old 10-25-2015, 10:58 AM   #17
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So still at it trying to eliminate the odor with partial success. I will try cleaning the p trap next. Tried some baking soda that helped for a few days. Very stubborn odor! Thanks for the insight
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Old 10-25-2015, 11:57 AM   #18
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Did you try vinegar with the baking soda??? Dump 1/2 - 1 cup of baking soda down drain and then pour in vinegar. The "volcano" effect helps clean the trap as it bubbles. Keep slowly pouring in vinegar until it eventually stops bubbling and let it sit for about 20 minutes then rinse out the trap. I do this at home with my drains and disposal and it works great.
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Old 10-25-2015, 12:15 PM   #19
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Have you tried replacing the "cheater valve"/anti syphon valve, near your P-trap. This solved our problem. We had our gray water tank valves "open" while connected to a sewer dump on our "full service" site. The "cheater valve"/anti syphon valve would typically stop odors from coming into our unit, but, ours wasn't working. A cheap fix ...bout $12.
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Old 10-25-2015, 01:59 PM   #20
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Originally Posted by RVhiker View Post
namusmc65, you may have a faulty air admittance valve under the sink. It admits air to the drain line to help it drain, and has a one way valve that is supposed to keep odors from escaping. Here is a short article discussing this type of valve: ASTVD Valve (clicky)

I had this problem, mostly when I had the fan on and no open window. I traced it back to the air valve under the sink. To test it, I used black vinyl electrical tape around the little vent holes in the valve and the smell stopped. WHICH REMINDS ME, I need to get a new air valve and replace the one with the black vinyl tape on it (for the last year or so)... there has been no problems with slow running water or anything... thanks RVhiker.. another thing on my list to do


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