The top cap where the laser lens are will not come off
sometimes it's soldered/glued to the board inside! don't just pull it off. is this a cheap red laser or a green laser?
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a 200 mw green laser i can see that the lens is dirt¥ but I cant get the cap off
Get a wide rubber band and wrap it round once to give you more grip on the cap.
Some caps are glued on tight, so if that doesn't do it, don't be tempted to use pliers, mole grips, stilsons etc - you'll definitely break, or at least misalign something.
Why? are you trying to do this