I don’t know what it is, but those cleaning tablets will cause my machine to suds up so much that bubbles/water start pouring out of the exhaust and all over my floor. One of the first times it happened, all of the bubbles were screwing up a sensor and I couldn’t get the machine to work for a week. I thought it was broken, and was just about to buy a new one when I got the idea to try sucking everything dry with a shop vac.