I seem to recall getting the soap once or twice...but my moms most effective one was a spoonful of cayenne pepper for swearing. That will definitely make you think twice before cussing.
For something besides swearing, there was a lot of different things..spoons, fly swatter, willow switch (Go cut a good one...it better be a good one because you certainly won't like the one I cut!). I don't recall what it's called..but you know those toys with the little paddle that had the ball attached with a string? Many of those got broken on the backside.
Parents have some of the greatest lines....you've just got you're ass whipped and sent to you're room. Mom checks in and you're crying & pouting, mumbling about how you hate you're parents, etc.. My mom would say "You stop that pouting young man or I'll really give you something to pout about!". I was always thinking to myself, "damn, I've just got spanked, yelled at and sent to my room, is that something I'm supposed to be happy about?!?"
Dirk