Carrots and celery contain vitamin A, good for healthy vision, tissue development and building the immune system.
We use a Champion brand juicer. It's supposedly easier to clean than a centripetal juicer. I'd say total clean up time with separate bowls, etc. to catch pulp and juice is about the same as that of a standard juicer.
We've got the liquid. What do you do with the leftover vegetable matter? You can find recipes for the pulp, but after so much carrot cake, you eventually just toss the pulp in the compost pile for the garden.
We use little 8oz bottles for the juice and refrigerate.
6-1lb bags of carrots
yields approx two quarts carrot juice