I would try GooGone or Ungu adhesive remover products. I found GooGone at my local dollar store.
Didn't like the look of ours after only a year with a new bath tub. We tried bleaching but that didn't really make it bright again. I've been buying those pretty clear bath mats that look like stone, very decorative and it covers it up and looks clean. I change them quite often but it's worth it to look clean and fresh.
First remove the decal with a putty knife (something that can help pry up the decal). If it is really bad shape (crumbling or falling apart), soak with baking soda mixed with water. Make a paste, and leave it on over night. This should loosen it up. Once you have it up there will be outline of where it was. Goof off, goo be gone or WD40 will get it of and it should be fine. If this doesn't work, please get in touch. I am expert in thrifty cleaning. I'll do more research. Good luck!
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