Wii Won't Read Dual Layer Discs

I went to go play Super Smash Bros Brawl to try out Project M, but I kept getting this error message.



And all my other games such as animal crossing, rhythm heaven and super mario galaxy work fine. I went to google this problem and read that my wii lens is dirty and it cant read dual layer games such Super Smash Bros Brawl, Metroid Other M, and the Last Story. I remember this happening to metroid other m few years ago and only working sometimes.

Right now i'm trying this method.

And so far I got to the health warning screen on SSBB, but never got the game to be playable. So I'm wondering if any of you guys got this problem before and were able to fix this. And also what other options I have to fix my Wii. What I don't want to do is opening my wii just to fix it. I'm just going to keep cleaning my wii lens until my game works

And also if this helps, I had my wii since few months after launch.