You can remove the carbs as a whole assembly (all 4 at once) and once out, remove the float bowls individually and clean all of the jets / replace almost all of the seals (you won´t be able to replace the seals on the fuel / air hoses going in between carbs). You won´t be able to clean the individual bodies, but after 8 years of sitting, it´s probably a good idea to clean whatever you can. It takes a while to put the carbs back on again, but it´s worth it to avoid having to deal with all of the throttle linkages. It´s still a good idea to synchronize everything though.