Read the excerpt from a commercial.

Our new stain-fighting formula will remove most spots and significantly reduce the appearance of any grubbiness your clothing may have. In our studies, up to 90 percent of all grease marks, food spills, and grass stains were completely removed. If you have a tough stain, you need our reliable whitening, brightening, color-safe detergent. Just follow the directions on the package, and your fabrics will look brand new in no time!
Which rhetorical strategy or appeal is used in this excerpt?