C.R. LAURENCE 17050 CRL Grime Scrub Brush. This CRL Grime Scrub Brush helps remove heavy grease and grime from hands and fingers. Gentle and effective cleaning action quickly removes grime, and the special row of stiff bristles cleans under fingernails. Bristles are firmly molded in place and the contoured handle provides a firm grip. Use in the shop or at home.. Part Numbers Variations: 17050