I clean mine as Proptop does. I use the cans of automotive spray carb cleaner. I have had no problems with the plastic parts deteriorating from it. If you soak the plastic parts in carb cleaner then you will have problems. I tipically brush the exterior clean of loose dirt, remove the carb and plug the hole with my thumb and spray it all down. Set it aside and clean out the carb with the spray. Then I will remove the back-plate and cylinder head and clean internally. Soak the inside with afterrun oil and reassemble.