I tried the hot water dissolving method with the laundry powder this morning, and came to the conclusion that perhaps I need to blitz it in the food processor as well - the hot water (and I used boiling water from the kettle) does not actually dissolve the grated soap in my mixture.
I am very pleased with the quality of the cleaning, though, and the pleasant smell which the soap leaves - it is quite faint and the washing I managed to line dry yesterday have a truly lovely line-dried smell - much better than any chemical smell you could add to the wash.
Guess I had better get the blitzing done!
The Psalmist Was Right
54 minutes ago