The best replacement for dilute sulfuric acid is concentrated sulfuric acid.

The best alternatives to dilute sulfuric acid are rated as following:
★★★★★  concentrated sulfuric acid

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Speaking about dilute sulfuric acid, one probably shouldn't forget about iron.

Other search terms related to dilute sulfuric acid and their ratings are:
★★★★★ iron
manganese
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dilute sulfuric acid
concentrated sulfuric acid