Are there Simpsons episodes with no bad language?

Of course.
I can't think of one single episode that contains any beeped swearing and the only swear words I can think of offhand are fairly tame, Dammit, Damn or Hell for example. Bastard was used once but in the correct usage.

I can recall the word "masturbate" being beeped which is odd because they've said the word before uncensored.