I have purchased this twice and will be repurchasing again very soon. Regular Zero Odor is great for everyday odors, but for really ingrained or pungent odors go Pro. Ive used regular, pro and pet but Pro is the best for me. It is not playing around, it kills the WORST odors. Ive sprayed directly on boy cat marking, embedded pet and kid odors in couch, even killed the odor in my old diaper can that I use as a litter can now. Washed, sprayed down and let sit in the sun to dry and there was NO SMELL. 10 years of funk in that can and its gone and it was BAD. I havent had it discolor anything but its strong so test first. If it stinks, zero odor pro got you!
