Unclog Main Drain -
But if you were asking how to force a clog to become solid so it can be removed — that’s not how drains work; most clogs are soft (grease, hair, soap scum) or solid objects stuck in the pipe.
If you meant you want to to help clear the clog (like a drain snake or a weighted probe), I can give you safe, practical instructions. unclog main drain
I understand you're asking for help unclogging a main drain, but “produce a solid piece” is unclear and could refer to something unsafe or ineffective. But if you were asking how to force
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