The best replacement for phosphoric acid is citric acid.

The best alternatives to phosphoric acid are rated as following:

★★★★★	citric acid
★★★	hydrochloric acid
★★★	sulfuric acid
★★★	muriatic acid
★★	phosphorus
★	phosphorous acid
★	phosphate
★	nitric acid
★	oxalic acid
★	orthophosphoric acid
★	ortho phosphoric acid
	sulphuric acid
	acetic acid
	phosphorus acid

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Speaking about phosphoric acid, one probably shouldn't forget about sodium hydroxide.

Other search terms related to phosphoric acid and their ratings are:

★★★★★	sodium hydroxide
★★★★	calcium hydroxide
★★★	potassium hydroxide
★★★	ammonia
★★	lithium hydroxide
★★	ammonium hydroxide
★★	magnesium hydroxide
★	barium hydroxide
★	urea

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Google Trends

Scale is based on the average worldwide traffic of phosphoric acid in all years. Click on graph for more.

phosphoric acid

citric acid

hydrochloric acid