Remove the battery door cover and flip the mouse on it's back

Remove the two screws in the battery bay that hold the top grip to the base of the mouse.

Use a flat head screwdriver and wedge the blade in-between the top and bottom part of the mouse. There is a small cut-out to work with.

Separate the top and bottom parts of the mouse

Remove the three Philips head screws holding in the forward/back buttons

Using tweezers or your hands, carefully remove the plastic buttons by following the direction of movement in each image.

You need to make sure not to bend or pull too hard to remove the buttons.

Use a Philips screwdriver to remove the two remaining screws from the grip.

Then, gently pry the mouse button cover from the grip using a flat-edge screwdriver. There is just enough space to get a fine driver wedged in place.

Use your fingernails or a spudger tool to push each plastic tab back (green)

Lastly, slide the button check clips down and then up in the direction indicated by the arrows to remove the button cover from the grip.

The grip and cover should be completely separated at this point

This is a good time to do some cleaning. You can wash all of the plastic components and scrub off any dirt.

Use a Philips screwdriver to lift the tip of the scrollwheel up and away from the top of base of the mouse

The clips holding it in place should click when you remove the wheel and should make a similar noise if you replace them

Insert a flathead screwdriver into the narrow gap between the clasp of the battery bay and the base of the mouse

Apply a fair amount of upward force to release the battery bay from the base

Next, remove the battery cable and slide the whole battery bay from the base of the mouse

Use a Philips screw to remove the only screw securing the board to the base

Push the retaining clasps outwards and slide the whole logic board out at a 20 degree angle. It should not require any force and come free

Follow these steps in reverse to rebuild the mouse.