I am often called out to service cabinets in Tandooree , Curry restaurants where I find the condensers thickly coated with grease. There is no way to clean these, apart from removing the condenser and replacing.

Are there any other novel methods , employing use of detergents, ect which can adquately clean the offending scum accumulation ?

The detergents available from my local trade counter bubble and blow, but are not effective

Any advice?