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Request a documentAzelis Surf DOSS 70 PG is effective in very low concentrations and therefore extremely economical to use. It is effective over a broad pH range - 1.8 to 9.5 (rendered ineffective in the presence of 1% caustic). The properties make it an economical choice for cleaning formulations for metal and glass. SierraSurf Doss 70 PG has been used effectively as an agriculture adjuvant to penetrate foliage when treating crops.