I highly suggest putting the left over tiny pieces of soap in an old or unused coffee mug and buying a brush to lather up with. It lifts the hairs and you get a better shave than with creams or gels just from the fact of the brush lifting the hairs.
I add some of my wife's shower gel to get a more pleasant fragrance and better lather if/when needed. I got tired of most of my gel/cream going down the sink or spending more time getting it off my hand than working up a lather and applying with a brush.
Plus you can make the lather really hot and that alone makes it 98% better than a can right there.