I just got done with an 66 Ford 3000 engine rebuild. At first I laughed when my brother suggested this cleaning method, but it works and it works well. Take a small bucket or coffee can (depending on the size of the parts) and fill it about 3/4 full with boiling (it must be boiling) water. To the water add about 1/2 cup of Simple Green (a little more if you have a large bucket.) Add your parts (as unassembled as possible) to the mixture and let them soak. I know this sounds rediculously simple, but it works like a champ. I was able to use a nylon brush after about 20 minutes and get my carb and pistons almost shining like new. On the pistons, nearly all of the baked on carbon was gone and I was able to softly brush off the varnish from the float and bowl. Keep in mind that this will expose all steel parts to water and air. You must make sure to lightly oil all the parts after removal from the water. If the water is hot enough, most of the moisture will evaporate quickly, so you will want to oil them fast. Make sure to use a CLEAN and lint free cloth. I also found that putting the parts into plastic bags (gallon size or roasting bags) after this cleaning helped to keep dirt off and it minimized the exposure to the air. Hope this helps. I found it much better than messing with all the harsh chemicals.
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