Originally Posted by
madfish
I assume the no sugar rule is to prevent it spilling and getting into places where you wouldn't want it to get. Does the same rule apply for salt?
No, salt is fine, I believe.
And Sugar is worse, as of course, when it gets warmed, it caramelises, making things sticky etc, so it if were to be spilled onto the centre console or the likes, then it could cause havoc. Salt, I don't believe would do the same.