My carbs were completely gunked up, I just did the chem dip for 30 mins (no more than that for aluminum from what I hear) and then I fresh water rinsed them and then blew air into all cavities. Last step I did was sprayed them all over with a carb cleaner and dried them up really well, made sure no water was present. I live in vegas so they air dried very fast. Then I put them back together with a rebuild kit. Carbs were as good as new when finished. You can search my posts / threads for my carb pics of the rebuild. turned out great.