Chris
Mean Green is a household cleaner. You can get it at Home Depot. You can also use any household cleaner, such as 409 or the Orange stuff. Even Windex. But I generally use MG. The principle behind this is that Mean Green will strip acrylic based paints, but not the factory applied solvent based paints.
For "highly thinned," I have used a 50/50 mix of color and clear flat, then cut with about 4:1 with water. In other words 10/10/80 paint/clear/water. Lee, of course, might use something different
By the way, that masking technique he developed really works well. And its very easy
Here is another link decribing Lee's weathering techniques:
http://forums.railfan.net/foru...um=1164646326;start=
In the meantime, thanks Gene for posting this!
