The Personal Hygenator was a gadget, created by Qwark ("Steve McQwark" at the time). It was designed to take care of all hygenic needs, but it has side effects including causing irritation and itches. Even though it was advertised by Qwark as a Gadgetron product, it was in fact not, and Qwark was later arrested for fraud. He was then fined 6,000,000,000 bolts in order to pay back his customers, who all suffered from Personal Hygenator Syndrome. However, Qwark continued to sell these devices after escaping from jail, and topped the 1,000,000 sale mark.
In Going Commando, Ratchet implied he once used a personal hygenator by scratching his rear after watching a documentary about Qwark involving it.