Demise - Screenwash As par of our glass care range, Reaper Detailing have developed Demise, the last screenwash you’ll ever need! It’s a highly concentrated blend of alcohols and glycols that rapidly removes grime and insects from windscreens. Effective from freezing down to an impressive –16°C. And can be diluted up to 40:1, which we recommend for the summer months. Making Demise a very effective, yet economical product to use. HOW TO USE: ¨ Mix to your desired dilution ratio, making the quantity required ¨ Poor into your washer bottle ¨ Job Done!