trisonic cd/dvd/cd-rom laser lens cleaner-liquid included ddi this trisonic laser lens cleaner is not only effective, but easy to use. it is essential to keep the optical laser lens clean in order to have a clear picture and / or sound. this newly developed laser lens cleaner enables you to clean dirt and dust from the lens. the 3 step process makes it fast and easy to use. step 1- apply 1 drop of cleaning fluid onto the laser lens cleaning brush. (for wet cleanings only) step 2- insert the cd in to the device, and hit play. step 3- now just follow the voice guided instructions and you’re done. (special instructions for using it with your pc / mac on back cover) the whole process takes under 5 minuets, and is recommended for every 20 hours of use. the fluid lasts approximately for 50 cleanings, giving you approximately 1,000 hours worth of cleaning.