Mixing some white vinegar and baking soda together in a spray bottle will work to remove mold from the shower and silicone around the shower.
If you can't get the mold off the shower silicone then you can just remove the silicone and replace it with new silicone after you kill the mold around the shower.
But the baking soda and water mixture works great for me to kill off and remove black mold from my shower and the silicone around it.