I'm a big fan of Koh and especially their sponges and cloths - which really are multipurpose. I've used the cloths on oven cleaning (combined with Koh and the black sponge, this really works as well as, if not better than, traditional oven cleaner) and recently tackled a shower screen with buildup using Koh and a cloth; use the ridged side to clean, scrub patch for tricky and fiddly sections, shined off with the flat side) and it's now sparkling. Definitely worth every penny and I've had mine for at least four years and they're still going strong.
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