I can click,but i can feel its gluedhello.
are you comfortable taking the mouse apart?
the sugar in the soda have congealed and are acting like glue, you click and it stays, right?
if you are lucky it is just the plastic shell that is sticky, remove the shell and wash in water and dissolve the glue away, dry and re-assemble.
unlucky, the switch itself is sticky with sugar. if this is the case you will need to not care if the mouse works again to attempt a fix.