Huggies Disposable WashCloths are one of those things.
We use the Shea Butter "flavor" but there are several others available. They are great because the soap is built into the super soft, super thick cloth. Unlike the regular washcloths that you have to keep squirting soap on, these stay soapy enough to wash baby from head to toe. All you have to do is wet, wash and toss!
We love these things!
If you have young kids, I highly recommend trying them- or if you need a baby shower gift idea, buy a couple packs of these! I believe that they come 20 to a pack for around $3.