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To keep your washer tub clean, use the SELF CLEAN cycle at least once a month or every 20 cycles.
Perform the recommended procedures below when using the SELF CLEAN cycle. On 2011–2013 models, the SELF CLEAN cycle is labeled “Pure Cycle.”
Remove all items from the washer tub and ensure the tub is empty. Laundry left in the tub during the SELF CLEAN cycle may be damaged.
Press Power to turn on the washer.
Turn the Cycle Selector to SELF CLEAN (or select Pure Cycle).
Press and hold Start/Pause (Hold to Start).
After the SELF CLEAN cycle, leave the lid open to dry.
The water temperature for SELF CLEAN is set to Hot and cannot be changed.
When noticeable residue is present in the washer tub, add 1 cup (8 fl.oz or 240ml) of liquid chlorine bleach to the bleach compartment before you start the SELF CLEAN cycle.
Do not use or mix any other detergent or chemicals during the SELF CLEAN cycle. If necessary, run a RINSE+SPIN cycle after the SELF CLEAN cycle has completed to help remove any residual residue.
Please be aware that certain usage and environmental conditions may result in residue build-up or odor in the washer tub.
Check the washer tub before using the SELF CLEAN cycle. Remove any water remaining in the tub by running the SPIN ONLY cycle before starting the SELF CLEAN cycle.
If there is chlorine bleach left in the washer tub for an extended period of time, rust can occur.
If you have additional questions you can go here: https://www.samsung.com/us/support/troubleshooting/TSG01108629/