The double wash/rinse procedure includes two washing steps and two rinsing steps. The two washing and rinsing steps are slightly different depending on whether a contaminated surface was relatively clean before the spill (see § 761.372 ), or whether the surface was coated or covered with dust, dirt, grime, grease or another absorbent material (see § 761.375 ).
40 C.F.R. §761.363