Deadshort480
We're here to fuck shit up.
Fine wool won't do harm to stainless steel. I've used it for years on expensive cookware and wheels. We're all already using all kinds of items to pick, scrape and scrub the airways in our Pax and the mouthpiece stem is probably the most durable part of all.
If you're still uncomfortable using steel wool, try your favorite "gentle" scrubber. Steel wool certainly does the trick, but one can presumably also use a rough towel, a magic eraser, a bent pipe cleaner, etc.
The point is, the temperature light issue is a cleaning issue and not a defect. Soaking in ISO is not enough. It needs to be scrubbed with something.
Add a 'stem-scrubbing' to your cleaning regimen and the temp light problem goes away. I've tested this multiple ways and it solves the problem 100%.
Take a piece of #0000 steel wool to a mirrored piece of stainless and you can see the clouding that appears on the surface of the mirrored steel. That clouding is a bunch of very fine, very small scratches. All steel wool will scratch stainless steel.