Snakes are commonly used to unclog bathtub drain pipes. Damage is unlikely to occur if you choose the proper size snake and use with care.
A hand auger is the snake of choice when unclogging a bathtub drain. Using the proper size snake is important to avoid damaging your pipes. Never use larger than a ¼-inch snake in a 2 inch pipe. A smaller size is less likely to cause damage.
Plastic bathtub drains require extra care. Go slowly to avoid scratching or puncturing the plastic. If the clog is severe, use drain cleaner first to avoid having to use too much pressure with the snake.