MisterMax Anti Icky Poo "Unscented" Odor Remover (Pint)

I have a male cat the sprays when stressed. Will this work on the furniture? Why is this 5 stars and larger size 4 stars

Does it damage hardwood floor? I read a comment stating they got the order out but somehow messed up their floor but They didn't have pictures.

The solution seems to remove the urine odor, but I still smell a leftover scent. Is that just the product or do I need to further treat the spot?

Is it safe for my cats to wipe the walls and bottom of my litter box before put fresh cat litter in?