What salt does, is increase the osmotic pressure (create imbalance) on the outside liquid pressure of new emerging ick protozoa, this pressure forces them to lyse, in others words, lose their insides to the water that surrounds them. Their normal fresh water pressure tolerance is under 3ppt salinity.
A salinity of over 3 ppt forces the liquid to rupture the cell wall to lyse (blow out their guts) similar to what we would do in outer space without a suit.
Heat makes their life cycle speed up, allowing the osmotic pressure to destroy the new ick when vulnerable.
This is also what happens to some bacteria when meds are added to the water, the med compromises the cell wall, killing the bacteria.
Hence the name for Lysol.
Just to be safe, putting your siphon in a bucket of bleach water after use on the infected tank, will kill anything in a short time, then completely dry it. This is good practice before using on another tank, or even on the infected tank to "not" reintroduce dormant ick.
If it smells of bleach, add new water and use a dechlorinator.
