With its extensive lineup of cleansing wipes and sprays, Weiman Products LLC is known for cleaning up. As far as The Randolph Group Inc. is concerned, the same can be said for Schiff, Hardin LLP. Led by partner Alexander B. Young, a team of 15 attorneys from the law firm represented longtime client Randolph Group last month in its sale of cleaning products company Weiman Products to the Cortec Group, a private equity firm. Terms of the deal were not disclosed. Established in 1988, the Chicago-based Randolph …