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@WestLawns @amici It bears mentioning that about 20L of total rinse water is needed to rinse a teracotta bench, after smearing (even better yet, gently scrubbing with a bristly brush) about 250 to 350ml of 10% HCl gel on it (2 or 3 applications and rinsings), depending on the filthiness of the bench. A hard, driving rain is not likely sufficient to completely rinse such a bench. Whatever bench gets cleaned should be near enough to a source of rinse-water.

Anyone fearing that the public will be burnt by the acid - no they won't: when the color changes from the gel contacting/mixing with the filth, it will no longer burn anyone - completely changing from its original blue to grey.

Example shown here:
https://c.im/@sbb/111917220612151510