
First of all I have to say that I worked at Davis Instruments from 2000 to 2005. I actually forgot Davis had this product. I used it on a shower tray with debris. Despite the ease of use, I did not get the expected result for my money. This product removes maybe 20% of that. This is oxalic acid in gel form. Bar Keepers Friend is a fortified form of oxalic acid and it really worked by removing it completely.

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