Do you ever overburn or burn disks that are dirty on the underside? Over burning reduces the life of your laser & can damage it during the burn process & I've come across where even dust can damage your laser. also i wouldn't recommend using a general purpes dvd laser cleaner or anything of the sort for 3 reasons. 1, a dvd rom as 1 laser read only & a dvd/cd burner has 2 which 1 is a reading & the 2nd. Some old ones switch positions & some overlap to do the same job. a DVD laser cleaner will only effect the read laser as you will find it impossible to burn to the disk as it would error. 2, The brush's for general lasers are to hard & abrasive that would damage the burning laser if it should ever make contact & 3, the chemical provided...