Try not to use the DVDs you can see through if you hold them up to the light (obviously you can't if they are the printed or printable type with an opaque coating) some have so little substrate the difference between 0 & 1s is not enough for our equipment. Taiyo Yuden CD's and DVD's such as JVC were the best but as optical discs are old tech, they sold off the production to CMC and you can't be sure you are getting them now unless specified in the advert.
It would be difficult to clean as usually the cleaning DVD is designed to play a video but the navi would probably just spit it out as unreadable.
You can get new laser assemblies on aliexpress or maybe disassemble and clean manually.
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