I used liquid soap (which is for the toilet bowl) to remove a small stain from my acrylic bathtub, and kept it on for awhile. After washing, I found the enamel came off on that portion leaving a blackish colour. It seems like the paint came off. The tub is new and now it looks very old because of that mark. The mark is on the non slip grip part, and unfortunately the mark is spreading everyday. How can I fix it? Please help. Thanks.
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