I haven't tried that but, in my experience an "AC regenerator" is the only thing that really works, but they're not cheap and cost several thousand for something that puts out enough amperage for power amplifiers.
A $250 Power Conditioner?
Howard reviews the Puron, which is a small AC power conditioner ($250 USD) "plug" that is distributed by Vera-Fi Audio. It’s said to cleanse the electronic circuit that feeds and audio system. Many tweaks cost a pretty penny for little or no performance increase. Is that the case here?