What does the cryptic crossword clue "Stain bad: finally going for cleaning solution (7)" mean?

The wordplay uses a charade (building blocks). SHAM (deletion) + POO (deletion) = SHAMPOO The answer is SHAMPOO.

Stain bad: finally going for cleaning solution (7)

Guardian Cryptic #29454 | 8 Across | 2024-08-06 flower