You know, when a bar of soap gets used down into a small chip, what do you usually do with it?
I wet it and meld it onto the next bar of soap.
I just keep using it until it disappears completely.
I’ve never had the slightest bit of success with melding it to the new bar. I toss it.
I always meld it to the new bar.
Irish Spring (which is what I use) seems to meld very easily onto the new bar.
Vios con dios, soap slivers.
What really happens is this: *Someone *insists on using bar soap despite liquid soap being right on the sink, so two-thirds used bars from the shower end up soap at the sink, and these slivers get left along the ledge of the sink until they dry out, crack, and curl up at the ends. Then I notice them and throw them away when they get in the way of cleaning the sink. No one ever mentions it.
I wet the old and new bars, get some lather on both of them, and stick them together. I do this at the end of my shower, so I can let them dry together. The old bar should fit nicely in the cup of the new bar. I’ve never had any problems with the bars coming unstuck, unless I don’t get them wet enough first.
They usually just disappear on their own. Often times falling and never getting picked up until the shower rinses it to heaven.
I don’t do this anymore, but I was really impressed when I saw J-folk who would stuff them all in an old clementine bag and hang 'em off the kitchen faucet.
The mesh bag is nice for scrubbing action, and you can use the leetle slivers until they disappear entirely.
I picked “I never use bar soap”, because I don’t. In the shower or bath tub, it’s shower gel. At the various hand-washing stations around the apartment, we keep liquid soap dispensers.
Back in the day when we did use bar soap, I would meld the old one to the new one.
I picked ‘I throw them away’…for me, soapbars don’t warrant the effort to ‘meld’ them (whether regular or expensive soapbars)
I save them in a mesh bag that lives under the bathroom sink.
I … haven’t figured out what to do with them from there, just yet. 
Toss em, I’m not usually frugal anyway but saving soap slivers will never make my list of ways to save money or not be wasteful.
I buy YUMMY smelling soaps and melt the last bits together to extend the YUM. I smell good enough to eat!
I live a wild, extravagant life. They get tossed.
Soap?
Toss em. Bar soap is one of the cheapest things you can buy these days. I’d glady pay the $1 for a new bar rather than having to use that little sliver.
Well, my BF goes through soap like nobody’s bizness, so I take the chips and put them in a jar with some water. When it’s semi-runny I fill the pump soap dispenser with it. I had made the mistake of buying scented pump soap once, and now he has to have that as well as the bar soap, so I clandestinely cut costs by adulterating the pump soap with the homemade mixture.
I put slivers in a mesh bag or scrubby glove, but only really yummy soaps from lush or similiar.
Smoosh it into a new bar. This works particularly well with the Cetaphil sensitive skin bar we use for our face. Not so much for the Dr. Bronner’s bar I use for my body or the Dial white he uses for his.