The opening definition of the headword itself (for which cf. under nu 372) is found in much the same form in the Synagoge (rho64) and in Photius' Lexicon (rho182 Theodoridis). Being third person singular, it must originate from a gloss on some (probably poetic) text, but the source is unidentifiable.
The rest of the entry derives from the scholia to Aristophanes, Acharnians 17-18; the Aristophanic passage itself is quoted in full. For "soap-powder," koni/a, see LSJ s.v., II; it was a mixture of ash and water.
[1] The correct classical spelling is r(u/mmata (as at rho 292).
[2] The Aristophanic passage quoted is part of a soliloquy by Dikaiopolis, who is recalling various occasions on which his heart has been (delighted or) grieved (the words kardi/a or ke/ar "heart" are used at lines 1, 5 and 12, and words for "grief" or "pain" appear at lines 3 and 9). These recollections prove to be a priamel to a declaration that none of them matches what he is experiencing at this moment -- coming early to the Pnyx for an important assembly meeting and finding the place deserted.
[3] Greek ko/nin o)smw/menoi -- nonsensical, but doubtless what the compiler wrote, since it is the transmitted reading in the Aristophanic scholion he was copying; this was emended by Kuster to koni/a| smw/menoi "who wash themselves with soap".