There are very few things in this world as gross as a backed up and overflowing toilet. The health hazards alone are enough to make you feel queasy. If a plumber is able to fix the clog that caused the backup of feces, urine, etc., then you will have to clean up the rest. (In some cities, you can actually hire a toilet backup cleaning crew, but this service is definitely not universal.) Here is how you address the mess on the floor. 

1. DO NOT Use Your Bathroom Towels

So many people, including plumbers, reach for the first absorbent things they see. Since bath towels are almost always immediately in view and within reach, this is what they grab. Do not do that. Yes, you can bleach the daylights out of your towels in the wash, but you can also destroy good towels doing that. Furthermore, towels are the perfect means for growing bacteria. They bunch up to create dark, moist folds in which bacteria from the toilet mess can grow and multiply. If you have to go to a laundromat to do laundry, the last thing you want is to have to wait a couple of days to wash these bacteria-laden, fecal-smeared towels. 

2. Use Heavy Duty Paper Towels or Shop Towels

These are just as absorbent, if not more so, than bath towels. Better still, you can throw these all away. All of the bacteria, all of the urine, all of the feces (both visible and microscopic), and whatever else surfaced over the toilet bowl is thrown in the trash where it cannot harm anyone. 

3. Definitely Wear Gloves

Everything from microscopic parasites, to eggs of intestinal worms, to killer bacteria is found in fecal matter. Before you start cleaning up the mess in your bathroom, don sterile gloves. You do not want to get violently ill from trying to clean up this mess. 

4. Wear Shoes With Rubber Soles That You Can Bleach

You are walking right into this mess when you start cleaning. Even after you get the majority of fluids and solids off the floor, your shoes have still touched it all. If you expect to continue wearing these shoes, you will have to bleach them. Make sure they have thick rubber soles so that they can tolerate a good bleaching. Then, put the shoes out on the front porch to dry. Use more bleach to sanitize the entire area around the toilet and anything the toilet mess touched when it overflowed.