What to do if the landlord is trying to charge me for carpet replacment due to cat urine stain found under a blacklight?

Question Details: I am 90% sure the stains were caused from optical brightners from my carpet cleaner. I want a 3rd party to inspect but the LL says it doesnt matter I have no say in it. Can I have any sort of case? As in, getting the carpets cleaned professionally and have the black light test re-took to see if stains are gone?

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