I am the author of that titled review and I just want to share my latest adventure through Litterland. I tossed what was left of the Litter Clean and purchased Fresh Step Multi-Cat Scoopable - UNSCENTED. What a difference!
There is no unpleasant lingering odor because, simply put, there is no odor. Why fragrances are added to cat litter is beyond me. Of course I don't want my cats' boxes to smell like poop and pee, but I don't want my cats' boxes to smell like herbal/lavender/citrus poop and pee either. Offensive odors should be eliminated, not covered up by some equally offensive scent.
I would be remiss if I didn't share my other findings. The Refresh, like most brand names, is more expensive. However, this could be considered a trade off because I don't use as much. I am still using the initial litter I put in 3 weeks ago and I don't need to add as much after each daily cleaning. It clumps fairly well and, unlike Litter Clean, I have not found any pasty puddles (which are impossible to remove with the best of scoopers) on the bottom of either of the two boxes. It's not perfect. There is some dust. The largest size I can find is 25 pounds. I prefer the 40 pound container as a cost saving measure. But on the plus side, I no longer have to wait for my husband to come home to carry it into the house and down to the basement. As long as they don't "improve" it, I am satisfied.