If the hot water method fails, or if you have standing water that won't drain, a wet/dry vacuum ("Shop-Vac") is highly effective.
Bring a large pot of water to a boil, then let it sit for a minute so it is "hot" but not "roiling" (boiling water can occasionally crack PVC or damage seals). how to unfreeze a drain line
The draft only fixes the symptom, not the cause. Recommendation: Add a short “Next Winter” section: If the hot water method fails, or if
Position a heater near the frozen section. Never leave it unattended. Heat Lamps: These provide consistent, directed warmth. If the hot water method fails
If you can physically see the frozen pipe in a basement, attic, or crawlspace: