A $250 Power Conditioner?

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.

https://forum.audiogon.com/discussions/puron-plug-in-ac-power-conditioner-impressions?highlight=Puron

There are several more threads within the Audiogon Forums.

@russter ​​​​@lak Thanks for posting.  Very interesting, and as audio tweaks go these seem very reasonable.

I used the Shunyata Venom plug in conditioner and it worked well, cleaned the noise from the outlet   When I bought mine, I don’t think it cost more than $200 but now the price is up to $300.  If the price is right, it’s worth a try.  If you buy from a place like MD, you get a generous  return policy if you don’t like it. 

Not sure if I can see how a small unit can clean the system but it might not hurt to try