Tweaks such as demagnetizers ionizers for lp's

The Radio Shack bulk tape eraser works well. It was discontinued some years ago but is available at very good prices on Ebay. For LPs and CDs and interconnects.

As Tzh21y says, I've had great success with the Walker Audio Talisman and use it as part of my regular LP playing routine. I also use it on my cables and speaker dynamic drivers weekly.

Last week, we had a group of 35 members of our local audio group together. The topic for the meeting was to share tweaks you find effective. The system was an all digital system and I demo'd applying the Talisman to CDs. Everyone heard a very positive improvement in the sound. Then I demo'd applying the Talisman to the cables and speaker drives. Unanimously, everyone heard yet a further very positive improvement in the sound of the system.

Highly recommended for vinyl, CDs, and your system cables and speaker drivers. It really does work.
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Half the price of the Talisman, way more effective.

Hand held demagnetizer

I have a GENEVA brand bulk audio/video tape eraser. I bought it for $99 about
ten years ago and don't know if it is still available. It does make a difference.
The sound is cleaner/clearer and dynamics are improved.

LP's do get magnetized. I've read that it is not the ink on the label, it is the
metal in the vinyl formula that is used to make it black. Over time it picks up a
charge. I don't really know the how or why, but I do notice an improvement. I
demag an LP once after I clean it. It is part of my cleaning regimen. I also use
the Cardas sweep LP once a week to degauss the system.

The more revealing a system is, the more noticeable this stuff is, IMO.

I hire a Indian medicine man before playing. He dances a bit, sometimes with his son when I have a new cartridge at the same time, with some luck it rains outside in the garden and it sounds definitely better after that.