!!! for urinating only !!!
My English is not all that good so I just copy and paste this article that explain exactly what I wanted to say:
Is the whole process of collecting and washing these wipes unsanitary? Not if you employ the method used by most family wipe families, which is to use the cloths for urinating only. (This still helps cut down on paper waste, since the majority of bathroom visits are of the first priority.) Since normal urine is sterile, there's little chance of encountering nasty bugs like E. coli later in the laundry room. But using family wipes for ahem, your more serious matters can also be perfectly hygienic, provided you separate them from your other laundry (your kitchen towels, for instance) before washing them in hot water and drying them in the dryer. If your kids are still in diapers of the cloth variety, all the better -- you can save water by washing the wipes and the diapers together.
So is it really worth the effort, from an environmental standpoint? If you're contemplating making the switch from the three-ply, quilted, extra-soft fluffy stuff to tree-free TP, then the benefits are clear: At present, more than 98 percent of the toilet paper sold in the United States is made from virgin wood (note: that statistic will improve soon, thanks to last year's Kimberly-Clark/Greenpeace agreement), which is destroying our forests and contributing to climate change, since forests are the most effective tool we have for sequestering carbon dioxide from the atmosphere. And while some may argue that washing cloth toilet wipes wastes water, it's nothing compared with the pulp and paper business, which is one of the world's largest industrial consumers of fresh water.
But can't you eliminate a lot of that waste and pollution by switching to 100 percent recycled toilet paper? Yeah, you can, which is the solution I'll be sticking with as long as I live in a one-bathroom apartment (no surprises for guests here!) with a community washer/dryer. It's not a perfect solution, of course; recycled toilet paper still takes energy and resources to produce, not to mention the fuel cost to transport it from factory to store.