My chip was wicked hot before removing the IHS and was wicked hot after. Hardly any appreciable temp improvement. That's what motivated the water build (which garnered me somewhere in the neighborhood of 15C improvement at load).
"Solder" is far too strong of a term. There was some stuff there, but the lid popped off on its own while I was razoring the edges without even requiring the application of any heat. Here's a pic:

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