Thats what the Panasonic DVD=R/RAM web site says.
Here is the link:
http://www.panasonic.com/industrial/computer/storage/dvdram/support/support.htm
The relavent text now follows.
"To Enjoy Your DVD-RAM for a Longer Time
- Cleaning the drive lens, DVD-RAM disks and PD cartridges
To enjoy your DVD-RAM for a longer time, clean the lens and your DVD-RAM disks and PD cartridges. The reasons for cleaning the drive and media are explained in "How Data is Read/Written". It is recommended to clean the lens and media about once every 1 to 4 months, using a purpose-specific cleaning kit. Note that with built-in drives, the amount of dust and dirt infiltrating the unit can be particular high depending on the capacity and location of the computer's cooling fan.
1. Lens cleaning
- Drive cleaning kit
Name: PD Lens Cleaner
Model: LF-K123LCA
2. Disk cleaning
- Disk cleaning kit
Name: DVD-RAM/PD Disk Cleaner
Model: LF-K200DCA
- Both of the above cleaners can be purchased at stores which sell the drive.
Note:
Using cleaners not designed for optical lens and disks can scratch the lens and disks, making it impossible to read data.