. "More specifically, the cleavable nonionic surfactants selected can be of the Formulas (I), (II), or (III), or mixtures thereof, and preferably of Formulas (I) or (II) ##STR3## wherein R1 is a hydrophobic moiety selected from, for example, the group consisting of alkyl, aryl, and their substituted derivatives such as those containing a halogen atom such as fluorine, chlorine or bromine, and wherein" . . . .