Clogged Drains in the Bathtub can become Slimy: This Should Not be Your Goal
A clogged drain is not a particularly difficult challenge. All you need for a simple clog is a wire clothes hanger, opened up to its full length. Keep the hook crocked, so that you have something to hang on to. Put a smaller hook in the opposite end of the hanger. Thread the end with the smaller hook down the recalcitrant drain, twist it in circles several times, and pull the entire glob of gunk out of the drain.
You might have a buildup of hair and other items in the drain. You might actually be surprised by what you find down there, clogging up the works. You can also buy a Drain Devil, which is a piece of plastic that has serrated edges that allow it to pick up the gunk in your drain as you snake it down the pipes. You do basically the same thing as you would with the hanger, but you don’t have to destroy a hanger to do it.
(Keep a paper towel handy, to wrap the mess in. You won’t want to touch it any more than necessary.) You will want to throw this gunk in the garbage immediately; make sure you seal it in a Ziploc bag when you dispose of it or it will stink up the house.
Keep whatever you used to unclog your drain; don’t throw it away because this will happen again.
Do not EVER use muriatic acid on your pipes. When it is poured down a drain, it smokes, it smells, it gives off dangerous gas, and it doesn’t always work. It can kill you and yours. Do not take a chance on it.
What is the other option? If you don’t unclog your drain, the water in the bathtub will back up and it will be soapy. It will get on the floor of your shower or bathmat and it will become slimy. (Note that, if it is already slimy, time will not improve its condition. You will need to clean the mat or shower floor after you unclog the pipes, or you could have a slipping hazard.)