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Powerflush guy reckoned he couldn't flush it. Any ideas what chemical I can use to break it up?

I've got some seriously weird crap in my central heating (only been in the place a few weeks so don't know history). It looks like some form of silicone lubricant. Has anyone seen anything like it? Must have pulled out about 250ml so far. Power flush guy was at a loss as to what it was or how...