Post clean experience:
- Measurement instruments (not only electronics, all of it): calibration and certification. I pushed for several certifications with some months in between to rebuild the trust in the equipment, but that didn't fly with the bean-counters.
- Calibrate the probes too, verify they remain in spec long term.
- Anything that measures with an orifice (things like gas analyzers, pressure probes, pH testers, ) : change the probe, don't clean, it is messed up and you'll never have a reliable measurement anymore, cleaned or not.
- Filters: Replace them, also the metal washable types.
- Reference speakers: sell them, especially so if they have a bass reflex port or something equivalent.
- Most medical gear: trash it, it cannot be trusted anymore. I think that is a rule anyway, but that gear is also used in different (non-human) contexts such as veterinary or in labs.
- Anything 'safety': radio wave protection, beam protection, thermal/electric insulation or detection: replace, you don't play with your own health.
Optics: I have no idea.
On another level: do not trust the insurance company when they state 'it is clean now and good for use'. Have it verified independently.