Free Berkshire Durx WipesGet Free Berkshire Durx Wipes. Berkshire Durx 770 is ideal for cleanroom and critical small parts cleaning. The Durx 770 cleanroom wipe is enhanced with an ultra-low particle and fiber wipe treatment to significantly reduce particles and fibers compared to other wipes. Just click ‘REQUEST SAMPLE‘ and fill up the form with your name and postal address. US & UK only