Originally Posted by
JammedStab
Never fly with frozen contamination on these [unslatted-swept wing] type of aircraft(unfrozen such as bugs would be of concern as well I suppose).
Never do so with any type of aircraft unless you have some kind of specific approval and are sure of what you are dealing with. While there is a weak correlation with hard wings - think of all the types you didn't mention that fall in the same category - one type being more at risk does not makes others free from risk. Contaminate the slat and leading edge of a slatted type and you will see a large, even alarming, loss of lift capacity and potentially hazardous changes to handling at and near the stall, which might be a lot closer than you expect.
The regulations now in force have introduced massive conservatism for ice, including on takeoff, but practically no aircraft in service today have had to comply to these rules, they predate their effectivity. Until the fleet is totally rolled over, the risk remains, and even the new regs don't allow for an intentional contaminated leading edge on takeoff!
If in doubt, de - ice or don't go.