Mini blinds. Soak in hot sudsy water in the bathtub, then I have Minimaids (suction cup holders) that attach to the shower walls, attach blinds, give them a quick once over with a soft scrub brush, & spray to rinse, let drip dry.
Fiberglass shower walls. Clean thoughly, then use a good car wax on the walls (don't get it on the floor), makes it easier to keep clean.