There are several ideas here on Hometalk from members. Some of these do say Ceramic so I wouldn't try those first. Best of luck getting those stains out!
Again use a lemon cut in half. The half lemon like a scrubber and the juice of the lemon takes out stains. Might have to use several lemons. Only thing that worked foe me.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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https://www.hunker.com/13420823/how-to-remove-stains-from-fiberglass-bathtubs-shower-stalls
There are several ideas here on Hometalk from members. Some of these do say Ceramic so I wouldn't try those first. Best of luck getting those stains out!
https://www.hometalk.com/search/posts?filter=clean%20fiberglass%20bathtub
Try Bar Keepers friend..it works great for sinks and hooefully for tubs!
Again use a lemon cut in half. The half lemon like a scrubber and the juice of the lemon takes out stains. Might have to use several lemons. Only thing that worked foe me.