The second half of disassembling a Logitech G502 Hero mouse (https://www.ifixit.com/Guide/Logitech++G502+Hero+Disassembly/140809)

Remove all visible screws inside the shell as shown.

Don't miss the hidden one in the bottom here.

To remove the right mouse button (left on the bottom), gentle pop the end of it up and it will come loose and feed out through the hole.

To remove the forward-most center button, press it inward from the outside, and using a plastic spudger through one of the now-empty holes, pop it upward and it will come off.

Directly beneath is the other center button which is removed in the exact same way.

Under the buttons you just removed is one more screw that holds the palm cover on the top of the mouse. Remove this screw.

You can now pop off the palm rest, starting at the back edge of the mouse with a plastic spudger. It pivots away from the mouse and comes off.

Remove the screw holding in the LED light tunnel.

And remove the whole piece. It helps to press outward from the inside, from the bottom of the white piece. It will be caught on the left side by a small clip, but it should pop out fairly easily.

You can now remove the left mouse button the same way as the right one. Pry up from the back until it pops loose, and feed it out through the front.

On the top, you can now remove this screw that is holding in the G6 button. Do not attempt to remove the screw beside it as it is blocked by G7.

Gently pop up the back of the G6 from the back with a plastic spudger, and simultaneously lift the G6 key. It needs to pivot upward to get around the retaining plastic clip. Be gentle, it should require very little force to wiggle out.

Now from the inside you an pop off the G7 key and feed it out through the top.

Remove the screw from the LED light plastic piece and gently remove it. It may require a spudger to pry it from the front around a small lip, but it's very thin so don't break it.

Using a very small tool pop these two clips over the screw holes and loose.

Wiggle the G4/G5/DPI button out by pressing them into the mouse from the outside, gently. It may take a bit of wiggling but it does come out without force.

I assume you could remove those last 2 screw and pop the G4/G5 buttons off from the DPI button, but this is sufficiently disassembled to do a really thorough cleaning job.