OK, this is a particular bugbear of mine: claims such as "Removes up to 100% of stains", "Up to 50% off" and so on. These are almost meaningless and simply designed to mislead.
If something removes "up to 100% of stains", then maybe on rare occasions it might remove all the stains, but usually it will remove anything from 0% to 99% of them. And here, "up to 60% less" might as well say "Prices reduced on some products. In some cases by 10%, in others 25%, in a few 60%. But don't expect to find any price reductions better than this. And some products haven't had their prices reduced at all." Aaargh.