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 to flush it out properly. It seems to be mixing with magnetite to totally block some sections. Really hoping someone knows a chemical that might break it up, otherwise it looks like pipe cut out time 
Pic shows when I emptied the return filter!
Pic shows when I emptied the return filter!
