What do you mean "aside from removing the tips"? (smiling winky face to denote a little sarcasm) There is no other regular maintenance needed if you are removing the tips. Honestly though, I have never used the milk cleaning solution, but I know the product to which you refer. It is an enzyme that will break down the milk chunks and let residue blow out with the steam. I just have this psychological aversion to the digestion process taking place inside the steam pipe. It does work, though, and is a fine substitute.
There is actually a way to install a small vacuum breaker on some steam valves themselves. If your valve has just the right configuration, and you know exactly where to drill, and you tap the threads, and you get a hold of the right valve, you can just install it yourself. It prevents the boiler disaster, and keeps the small daily build-up to a negligible minimum. See it here:
i would never never let my steam wand touch chocolate. eeeeekkk
The coffee shop I work at uses powdered mocha(not my choice obviously as I only work there). Would you steam it with the milk or put some in the bottom of the cup and use the espresso to warm and mix it before putting the milk over it?