Why would you be doing it if it is an apartment complex? Not your responsibility and I would not want the liability, especially if you are planning on using the nuclear option such as acid.
Muriatic or phosphoric are too strong, they will damage the wood fibers and you will play hell neutralizing them once soaked in the wood.
Oxalic acid is used for bleaching wood and is not nearly as nasty to work with.
(edit: call me a maroon, for some reason I had a wood deck in mind-I shall now hang my head in shame)





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