This is something that i have been looking into alot recently.. with little results
Cleaning off baked on oil under cam covers is the main reason i needed this info.
1st try - Kenco water based degreaser mixed 1 part to 20 parts water - worked but not well enough after soaking for 48 hours. These are cast alloy cam covers and at this mix, no corrosion present.
Trying to get a hold of parts cleaner fluid, but cannot find this in any retail store and my Mech has it for $60 for 20L (brand unknown to me)
Spoken with a polisher who is getting in some new stuff to try, but thats $150 per 20L - so will wait for results from them
Currently left the parts with my Machinist to run in his engine bath setup - get them back tomorrow and see how they turned out.
Carbie Cleaner worked awesome, but not very cost effective to use the cans of that @ about $20 a can. i think i recall someone telling me about getting tubs of this stuff, that they soak carbies in, but depending on the parts size and how often you use it, this might be overkill
Kero - kero and diesel works, MR 30 - how is the smell of the shop area you use this in? is it individual parts or setup in a parts washer?