First, don't panic.
Armorall is a plasticizer that helps restore plastic. It probably wasn't bad for the raft at all. Now that you've taken it off with the dish soap head down to your local raft shop and see if they've got some 303 plastic protectant or whatever they have to treat PVC, and follow the directions. It'll be really slick at first but the residue will wash off.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse