: Water stands in the sink or tub and doesn’t move at all.
If you’ve tried the above for 45 minutes with no success, the freeze may be deeper in the wall (in the vent stack or horizontal drain line inside an exterior wall). In that case: how to thaw a frozen drain trap
After 10–15 minutes of heat application, slowly pour a cup of warm water down the drain. If it gurgles and drains, you’ve succeeded. If not, continue applying heat. : Water stands in the sink or tub and doesn’t move at all
Best for: Metal or PVC pipes (Safe and gentle). you’ve succeeded. If not