Is there a rubber gasket that gets exposed to the soap (lye contact is what I'm thinking about)? If so, I'd probably clean it really well and then run it with just water to rinse it really well. I'd probably still use it for food if it only had that one contact, but others may not. But I think it depends on how that particular blender is made. Some of the newer ones come all apart for super easy cleaning. Not like the old ones that were first available when I was young.