How would you handle this?...

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I look at it this way:

Urine & fecies contain moisture which sinks as far as the moisture and carpet fibers will allow.

The more moisture, the further down it will penetrate.

Maybe into the carpet backing, maybe also into the underlay (pad), possibly even as far as the flooring which may be timber or concrete.

I do not care how many people tell me that if I use such & such product with bonnets, I will remove the problem.

I prefer to satisfy myself by doing tests to see how far the problem goes.

This includes using a moisture sensor with probes to check how many and how big an area has been contaminated.

I may also use a high intensity ultra violet light to ensure that I have not missed anything.

I may also lift the carpet to check the backing, pad and flooring, (I think you guys call it sub-floor?).

If the pad is contaminated, I replace it.

If the flooring is contaminated I treat it.

I also treat the carpet backing as well as flooding the carpet and extracting with a water claw.

I DO NOT BELIEVE THAT BONNETING WILL REMOVE DEEP DOWN URINE.

Sure, you can flood it with different chemicals and keep bonneting (extracting), but I like that fresh water going in to flush the nasties out with an extraction machine.

If you don't flush with fresh water, you still have a multitude of mixed chemicals in the carpet.

If someone gets sick from these chemicals, who will be liable.??

That's my take on all urine problems, the same goes for vomit.

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