BAH! Everyone wants to use chemicals these days.
Try using butter first. Vegetable oil works well too.
Put it on the gooey stuff and leave it on overnight. It should just wipe off in the morning. I've been using butter for years on delicate plastics and it's always worked well.
If your glasses fog up and you want to make your own mask fans, here's how;
"My happiness doesn't depend on anything. My heart is always happy. I do have anger issues though."