It's not as hard as you might think .
There are cleaning discs but some people claim they can mess up a drive .
The simplest cleaning is using canned compressed air.
Spray some in the open drive door . Use a light touch is just small dust .
If that doesn't do it then you need to use some cleaning solution made for getting
"scum" off the lens .
Or try a cleaning disc.
Right now it's barely working so you don't have much to lose.