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The Natural Philosopher

wrote:
Had fun shoulder deep in blocked drains today, but what I fished out
puzzled me a bit. The pipes were caked to blocking point with a soft
white solid. I cant work out what it is though. There were a few rice
grains floating about, so perhaps a block of congealed rice? Also
wondered about solidified washing powder, but I would have thought
that would wash through, being water soluble.

Any ideas?

NT
probably partially emulsified oils and fats.