Review (3/5): I Found A Way To Save Money!!!
Does the job, but the price is absurd. I found a substitute that is less than half the cost.
[[ASIN:B00TG1AQSU 7 Panasonic ES-4L03 and WES-4L03 Replacements with a FREE Shebang Bottle - Citrus & Mint - FREE SHIPPING!]]. They also sell other quantities and scents.
The brand is Shaver Shebang. It's also a concentrate, actually it seems to be much more concentrated than the Panasonic detergent. You mix a packet into a bottle of water and then use that bottle to fill the system over three times. I just started using it and am happy with the results.