Hi @john1223456
The impurities in the liquid causes corrosion and provides circuit paths for the electricity which were not in the mouse's operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away
First do not try to charge or to turn on your mouse and then open the mouse and remove/disconnect the battery as soon as possible from the mouse to minimize any further damage.
Then you need to dis-assemble the rest of the mouse and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and liquids. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better
Here is a link that describes the process. Electronics Water Damage
As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove any shields that may be covering some components as the liquid may have got in under there.
Hopefully after you have done all this the mouse might possibly work correctly again.
Here is a link to a video that in general (not your particular model) shows how to open a wireless mouse, that may help. Also the user manual for a HP Spectre mouse may give some further clues how to possibly disassemble it.
If this process seems too daunting, take your mouse to a reputable, professional electronics repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.