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Combine 1 ounces of baking soda with 4c (950mL) of water. This will be your cleaning solution. Make sure the baking soda dissolves into the water before you begin. Locate the water cup on your steamer and empty out any remaining water. Pour your cleaning solution into the water cup and return it to the steamer machine. The water cup is usually located on the steamer base. You may want to perform this cleaning activity outside (or in the garage) to avoid making a mess on the floor of your home. Once the cleaning solution is in the water cup of the steamer, you'll need to let it stay in there for 3-4 hours while it does its job. Sit the steamer on a solid surface during this time so it won't tip over or spill the cleaner. Be sure not to run the steamer (or even turn the machine on) while the cleaner is inside the machine, as this could potentially damage items it comes into contact with. Remove the water cup from the steamer and dump out any remaining cleaning solution. Rinse out the water cup to make sure it's fully clean and doesn't have any residue left inside. Be sure to dump the cleaning solution out in the sink or shower. Don't dump it outside as this could ruin your grass. Once you have completed the cleansing process, pour water back into the water cup and turn the machine on. Let the machine run so that some of the water comes out and filters out the rest of the machine. Repeat this process several times, or until the water being rinsed out doesn't look dirty anymore. If your rinsing water continues to look dirty as you pour it out, you may need to repeat the process with the cleaning solution another time.
Make a cleaning mixture. Pour the cleaning solution into the machine. Let the solution sit for several hours. Dump out the cleaning solution. Flush with clean water.