Are interior cleaners safe to use on touchscreens and piano-black trim?

Some are, some aren't. Reviewers consistently call out that pH-neutral, residue-free sprays (like Chemical Guys Nonsense or Gtechniq I2 Tri-Clean) are safer on screens and gloss-black plastic because they don't leave streaks or haze. Anything with silicone-heavy protectant chemistry can smear screens, so the safer practice is to spray onto a microfiber towel rather than directly onto the surface.