Mold in tank - Rowenta Compact Steamer - White

try using a sterilising agent such as nappy san or nappy sanitizer or baby bottle cleaner

bleach

The mountains of Mt. Fuji have blessed you. Just kidding, have you ever dropped this iron? Mold may be growing where there is a leak in the holding tank. Water and electricity do not mix, time for a new unit.

Small appliances nowadays aren't really designed to be taken apart. Most likely there wont be replacement parts, you are probably better off just buying a new one.

I'm willing to try this to clean the mold out of the steamer container and possibly the rest of the attachments:
1. Empty the water reservoir completely. 2. Place 20 mL of CLR or bleach into the reservoir. 3. Fill the reservoir with hot water. 4. Shake the reservoir to mix and let stand for about 1 hour. 5. Empty the reservoir completely. 6. Rinse the reservoir 3 or 4 times with cold water. 7. Fill the reservoir with distilled water. 8. Run the steamer into the ventilated air a couple of times to ensure that there is no CLR or bleach residue on the evaporation elements. Thus, there will be no bleach on your cloths.
I have the same problem and will try this out tomorrow. I will tell you how it turns out.

First with the iron cold fill the reservoir with white vinegar.  I would let this sit for a few hours and then pour the vinegar out of the iron. I would do this a couple of times until you see the mold is removed from reservoir. Next fill again with vinegar and run the iron on the steam setting, steaming a clean rag or towel until all of the vinegar is steamed out of the reservoir.  The vinegar will also remove any mineral deposits built up in the iron.
Next rinse the reservoir by filling it with water and emptying it completely a few times.  Follow this by filling it completely with water again and setting the iron to steam setting.  Use another clean rag or towel and steam it until all of the water has been steamed out of the reservoir.
In the future make sure to completely empty your iron after every use to prevent mineral build up and mold growth

this is from conair instructions included with steamer, finally found it, hope it helps some!