You can have one of several materials covering the walls of your shower enclosure, including tile, stonework and fibreglass. Unless you have a shower curtain, though, your enclosure probably has a glass door. Glass lets in needed light, and it's relatively easy to keep clean. There are two types of glass shower doors: those that pivot on a hinge, and those that slide in a track. Whichever you have, removing it is a simple task that shouldn't take more than 30 minutes.
Stand inside the tub or shower enclosure and grasp the edges of the sliding door on the track nearest you.
Lift the door until the bottom clears the metal track, then angle the door so the bottom comes toward you. At the same time, lift the door until the runners on top come free from the track. When they are free, pull the door toward you, hold it sideways, and take it out of the enclosure.
Remove the other sliding door from the outside track in the same way.
Unscrew the screws holding the top rail of the frame to the sides, then lift it off. If there are no screws, tap upwards with a hammer to knock it loose.
Unscrew the side and bottom rails and pry them off with a pry bar. Scrape off the old caulk with a paint scraper, then fill the holes with epoxy filler that matches the colour of the background.
Go inside the shower enclosure and examine the metal trim along the inside of the door frame, if your door has a metal frame. You should see three or four screws holding the door to the metal frame attached to the wall.
Unscrew and remove these screws with a Phillips screwdriver, saving the top one for last. Support the bottom corner of the door, or have a friend support the door, while you remove it. Pull the door away from the frame. It should slide right off.
Unscrew the top pivot post on a frameless door, keeping the door closed while you do this. Pull the post straight up when the screws are removed, and let the door sag into the frame. Lift it off the bottom pivot post to remove it.
Remove the frame using the same procedure described in the previous section if you want to replace the door with a shower curtain.
If your door is hinged and in a metal frame, it is probably clamped into the frame with a long rubber gasket. Be sure the clamping screws are tight and that the door doesn't shift positions in the gasket, or it won't fit back in the frame.
Stand the door on its edge against a wall and cover it with cardboard or a blanket as soon as you remove it to protect it from damage.