I'm sorry to hear about your messy experience!
What do you mean "the light magenta was always empty"- do you mean it emptied before the rest, and you refilled it, before noticing fluid dripping from the printer?
What is the fluid level in all the other carts- are they about equal? Do any others leak when you tilt them exit valve down, like the VLM cart?
Does the VLM cart leak from the exit valve or air inlet point when tilted down?
Did your maintenance tank overflow?
Windex or other ammonia cleaners work well at cleaning ink or flush off surfaces, though wiping it up ASAP with paper towels and water is important to avoid or reduce staining, as the longer it sits, the more it absorbs. I've successfully used Mr. Clean Magic Erasers on walls and plastic, but not wood, so I'm not sure how well or IF it would work on wood...
Please let me know so I can help you past this.