How to remove rat urine smell

How to remove rat urine odor from an attic or ceiling space.
Hi guys

My formulation works very well on rat urine but the difficulty for alot of people is usually trying to find all the contamination’s and treat them. If the rat urine is in a confined space it is easier but a large attic with poor access can be alot more difficult.

Here are the step by step instructions on how to remove rat urine odor from a attic and ceiling

Use Formula two

rat urine in insualtion


The ability to remove the rat urine smell relates to what the ceiling or attic space is made from. Urine will penetrate to different levels depending on what the substrates are in the roof. Typically the framing is raw wood which absorbs rat urine quite easily and if the rat urine is over a long period of time then you will need lots of treatments to penetrate in as deep as the urine is and the other issue is the ceiling lining and insulation if there is any.
The video below gives a step by step guide on what treatments to use.
If the ceiling material is made out of fibreboard, plaster board or gib board or similar then that is also very absorbent and hard to remove. Easier to replace the boards in some cases

In a lot of cases we had to treat the timber 3-4 times with Formula two then once dry, seal it with a very resilient sealer to lock in the residues

Drywall can be treated however if the contamination is severe it can often be easier if budget allows to replace it. A good way to test it is to apply formula two and watch for foaming. let it settle for 5 minutes then apply more chemical. If you get the same amount of foaming it means it is a severe contamination and will either require multiple applications over a period of a day or replacement

hope that helps
Ken The odor Dude

More information on


rat urine in attic

Photo shows rat urine and feaces

When you are finished, Ozone the entite area to complete. Ozone is very effective for odor removal and can boost the whole process plus sterilize your home and serve many hundreds of useful purposes around the home

Here is the link to buy the ozone machine we use


8 thoughts on “How to remove rat urine smell

  1. Helen

    Hi Ken, after removing the insulation & rat droppings & vacc the whole area, the ceiling was so badly damaged (plaster board) we removed that as well but still when we turned on the heating the smell was terrible!
    So we mixed up the Formular 2 and using a spray bottle we drenched the dirty areas on the ceiling rafters where we could see the rats had been travelling to & fro, the ‘urine’ marks went very frothy but the ‘footprints’ nothing happened! As directed we kept mopping up & re- spraying until the foaming stopped on the urine soaked areas. When completed we allowed it to air dry with all doors & windows open & a good stiff breeze for several days & then closed it up & turned the heating up full!!
    AMAZING … fresh as a daisy!
    We intend to have the ceiling back in this week.
    Thanks a million the best $10 we have EVER spent.
    Helen & David.


        Hi Ken, do you have a remedy for oil based paint smell? Window frames & skirting boards were painted 2 weeks ago and the smell is still very unpleasent, please can you help?


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