I used Armorall on my Ultravid because the rubber smelled so bad but I wiped most of it off after a few minutes. Never had a problem.
With the Swaros I just use water. I see a lot of birders slopping on sunscreen and insect repellent and then using their bins. That, I believe, is the source of many problems associated with armor deterioration. I've seen more than a few Swaros with bubbling armor. Get a repellent with DEET in it on your hands and you're pretty much guaranteed to have problems.
https://www.mosquitnoband.com/why-shouldnt-i-use-deet/
Water...the universal solvent.