ORIGINAL: ameyam
External cleaning with alcohol makes a lot of sense. How about internal cleaning and how often should it be done?
but need be pure alcohol, no alcohol with high density of water.. water only allow to promote corrosion and doesn´t clean nothing..
here in my country is more easy because we can buy high density alcohol in gas posts, but i think there already have ethanol to buy too.
Alcohol of supermarket is very weak and don´t will clean nothing.
About internal clean, if you didn´t make any wrong thing like crash the airplane in dirt region, its not necessary.. only some carb clean after long time of use, and maybe a head chamber clean if begin a thick castor varnish..
If you fly in off-road land, then, is good to use an air filter to prevent cylinder damage..