If you cannot reach the pipe and hot water doesn’t work, you can try suction.
A space heater and a heavy towel or blanket. how to thaw frozen tub drain
If you have tried hot water, a hair dryer, and heating pads for 2–3 hours with no success: If you cannot reach the pipe and hot
Best for metal or plastic pipes that you can physically reach. a hair dryer
Thawing a frozen tub drain requires patience and gentleness. Never rush with excessive heat — slow and steady is the key to avoiding burst pipes and costly repairs.
This is the safest first attempt. It uses hot water to melt the ice and salt to lower the freezing point of the remaining water.