This is great all-purpose cleaner:
In a spray bottle, mix 2 Tbsp Borax with 32 ounces of warm water. Add 1/4 cup of white vinegar, and 1/4 cup dish soap.
The vinegar acts as a disinfectant. The Borax adds the extra oomph that the dish soap needs to do its job.
Perfectly safe, and cheap. I've been using it for a couple years now for absolutely everything (countertops, floors, toilet surfaces, etc.) When you're done with the rag, throw it in the washing machine.
For glass or chrome surfaces, you'll need a separate spray bottle of 1 part vinegar to 4 parts water.
Another key tip: NEVER use sponges-- because they rarely dry completely out, bacteria stays alive in them. Then, when you re-wet the sponge, the bacteria is re-invigorated and you spread new bacteria on surfaces you're trying to clean.