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If it's that hard, just use it like a soap, use a fairly wet brush and swirl directly on the cream in the container till you see bubbles start to form then either face lather, or move to the bowl to...

Do you know if this is old stock? Is it really dark purple and the tub only looks half full? Where did you buy it from? There were some NOS tubs of this stuff that has been floating around, over time...

Try letting it sit in a very small pool( a tablespoon?) of hot water to dissolve before you start trying to build the lather