I used the fine grade Optimum Towel for the first time this morning and I tested it against a Speedy Surface Fine Towel and a Nanoskin Fine Wash Mitt and my initial impression is that it is the least aggressive. Which is great imo. It fills a needed gap between softer original clay bars and these more aggressive clay bar alternatives. I`ll test again this week on a soft black panel to test marring, but for now I do think it`s less aggressive than other fine grade towels.
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