What you'll need
Step 1 - Produce your Travetine-Safe Cleaning Solution
Before the cleaning can commence, you'll need to take a few moments to produce a natural, travertine-safe cleaning solution. Begin by combining an all-natural liquid soap with warm water in a clean empty spray bottle. Follow up by securely sealing the bottle and shaking it until your newly formed cleaner begins to sud.
Step 2 - Apply Your Cleaning Solution
Now that your cleaning solution has taken shape, use your shower-head to give your travertine tile shower a thorough water rinsing before proceeding to dry it with a clean cloth. Next, apply your homemade cleaning solution to the area you wish to clean and wipe it down with a sponge or washcloth using broad circular motions.
Step 3 - Rinse Your Shower
Once your shower has been successfully cleaned, use your shower-head to rinse away any remaining traces of your cleaning solution. Any caked-on soap stands to lead to the formation of mold and/mildew, so take care to be thorough when performing this step.
Source: www.DoItYourself.com