Eventually, though, there'll be a heavy-duty obstruction that no amount of Drano can clear, forcing you to run a drain snake through the overflow, like the Baceyiou 25-Foot Drain Auger.

[33 Ft of Flexible Steel Wire Easier to Reach Difficult Clogs]: This professional plumbing snake drains auger comes with 33 ft of heavy-duty spring ... highly effective drain auger for unclogging ...