1. They aren't abrasive, they are polar. Abrasive makes them sounds like they have gritty particles. They do not.
They are just solvents.
Most of these solvents will not harm switches/circuitboards (well, maybe apple ones, depending on what kind of protective coating they use).
2. The amount of effort it takes to have a coating that is resistant to almost all cleaners is completely and utterly trivial to a company like apple.
It's not a hard problem. It's not even a problem.
To put this in perspective for you, I can walk 1000 feet from my house, and get stuff that will function as an optically clear anti-reflective coating that is resistant to almost all chemicals.
(These things are portable to other coating types, too.. The wood end table i spray finished sitting next to me could be dipped in acetone, denatured alcohol, whatever, and it wouldn't affect the finish)
So yeah, i'm going to go out on a limb and say "apple has to figure out how to use coatings that resist these kinds of things", because it's 100% cheap and trivial.
Most of these solvents will not harm switches/circuitboards (well, maybe apple ones, depending on what kind of protective coating they use).
2. The amount of effort it takes to have a coating that is resistant to almost all cleaners is completely and utterly trivial to a company like apple.
It's not a hard problem. It's not even a problem.
To put this in perspective for you, I can walk 1000 feet from my house, and get stuff that will function as an optically clear anti-reflective coating that is resistant to almost all chemicals.
(These things are portable to other coating types, too.. The wood end table i spray finished sitting next to me could be dipped in acetone, denatured alcohol, whatever, and it wouldn't affect the finish)
So yeah, i'm going to go out on a limb and say "apple has to figure out how to use coatings that resist these kinds of things", because it's 100% cheap and trivial.