Say goodbye to dirty pipes, rigs, and bongs with Grunge Off 99% Isopropyl Alcohol. There is a significant distinction in cleaning power, from 90% to 99%, and that extra nine percent makes all the difference. Use it to remove grime, resin, and build-up, leaving your smoking tools spotless and ready for use. With a big 16 oz bottle, Grunge Off Isopropyl Alcohol is a must-have for every smoker.