| 摘要 |
The invention relates to a method for cleaning metal parts, according to which said metal parts are treated with a compound of formula (1), wherein A represents (CH<SUB>2</SUB>)<SUB>a</SUB> or phenylene and R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP> and R<SUP>4</SUP> are identical or independently of one another represent C<SUB>1</SUB> to C<SUB>6</SUB>-n- and/or iso-alkyl and a represents a whole number from 0 to 4. |
