Cleaning your steam cleaner

I can't help to think what the inside of this thing might look like after 3-4 years of using my steam cleaner for records. Anybody ever clean yours, and how did you.
If you rinse and run vinegar then bleach then rinse it seemed to help mine. I did it outside for fumes.
Treat it like a coffee maker - Lime scale builds up, especially if you use tap water. I agree with the vinegar recipe above. A little bleach solution also, if you see any evidence of black mold like the kind you might see in humidifiers. Yecch.