The term 'OLD-TIME LAUNDRY SOAP BRAND' can be summarized by the crossword solution 'RINSO' (5 letters). RINSO was a brand of laundry soap that was popular in the early 20th century. It was first introduced in 1908 and was manufactured by the Lever Brothers Company, which later became Unilever. The soap was advertised as being able to remove dirt and stains from clothing without damaging the fabric.