I finally found time in decent weather to erradicate Stinky's (the cat in question, and that's his real name) territorial markings. I used just water with baking soda and then rinsed with plain water. It seems to have worked!

By the way, Stinky is not called this way due to his constant pissing, but due to his aromatic flatulence. The first time I encountered his emission, I nearly died!

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