Sometimes, showers just need some good old TLC and sometimes, you just have to give in. Like a child who has fallen on the school playground and comes home with dried tears that have caked on their face because it was mixed with dirt, your shower needs to be hugged and wiped of its tears. You can start by literally spraying and wiping away all the water marks that have been left on the clear door. As for the more deep cuts and scratches, you may have to end up turning to shower repair kits.
Shower repair kits are a valuable to any do-it-yourself-er who needs to fix up their tubs or showers. They typically come equipped with polyester resin, hardener, fiberglass mesh, colorants, sandpaper in different kinds of grits from course to very fine, thickener, protective gloves and a mixing container with stirring tool. Now, the purpose of a shower kits is so that you can save money while convincing yourself that you can fix something if you put your heart in it. If you are not up for the hours it will take to get your shower looking brand new again and don't want to inhale an unhealthy amount of toxic chemicals, than by golly, it is your chance to get your hands dirty!
The first thing you have to do is to clean the area going to be repaired. Sand, remove wax, wipe down. Do whatever you have to do to get rid of the surface contaminants. You are going to literally start on a fresh slate. Next, mix the tint, resin and thickener like the instructions tell you to. The toxic smells can be serious so wear a mask and glove. Follow their safety directions closely because you don't want to end up passed out on the floor of your shower and have your husband find you in that embarrassing position.
Use a flat tool like a putty knife to scoop out the mixture and apply it to the damaged area. Spread evenly and don't worry if it is slightly raised above the original surface because you will end up sanding everything down anyway. Allow it to harden for about two hours and then begin to sand the affected areas. Buff the repaired sections and then gloss it over with a strong finish so it matches the original gloss. In no time and with no help of a plumber, your bathroom shower enclosures will be good to go!