I'm experimenting too. So far my first batch is
1 3/4 c tropical traditions bar coconut soap, frozen and then put through a fine shredder on the food processor.
1 3/4 c washing soda
1/4 c oxyclean
1/2 packet lemishine (we have hard water)
It seems to work ok, though my tester (a little cloth wipe which I prestained with a million things, lol) did not get clean until I added a prewash with 1/4 c Clorox.
I'm still working on it...