How To Clean Between Sliding Shower Doors . Push the sponge through the crevice. Steps to clean sliding shower doors step 1: Mode Glaser premium 8mm easy clean left handed sliding shower door from victoriaplum.com Wear a rag, mask, or ventilator over your mouth and nose. Lift up on the door a bit to get the top unhooked, pull the bottom outside the shower, and lower it to the floor. Wear gloves to protect your skin from contact with any hazardous chemicals.