I would take the PC apart, then use a can of air to blow debris off the components. (gotta get the dust as well as any eggs.) The hard part would be opening the PSU and blowing it out. This can be super dangerous, leave the unit unplugged for at least 24 hours and do not touch anything inside with your bare hands or anything conductive. Then install fine mesh over any vents or hold in your case to prevent them from getting inside in the future.