Save the bleach for your laundry and your bathroom tiles. If your shower drain is clogged, you need mechanical removal (snaking or pulling) or a chemical reaction that specifically targets organic solids—neither of which standard bleach provides.
If you want a chemical solution, look for enzyme-based cleaners (like Green Gobbler). These use bacteria or enzymes to actually eat away at the organic matter (hair and soap) rather than just burning it with harsh chemicals. does bleach unclog shower drains
If your drain has old residue from other cleaning products (especially ammonia-based cleaners), mixing them with bleach can create chloramine gas. This is a highly toxic gas that can cause severe respiratory distress, chest pain, and even pneumonia. Save the bleach for your laundry and your bathroom tiles
If you have already poured bleach down the drain, do not pour other chemicals immediately after it. Flush the drain with copious amounts of water before attempting any other method. These use bacteria or enzymes to actually eat