My two cents worth !
There are various ways of getting paint off the cab of your trucks, some are better than others, some can even deform the plastic !
I have tried a few but this is the best method i have found so far.
The cab i am stripping is one of the old Merc SK's which was painted with automotive bright orange paint and had black wheel arches. (sorry, i forgot to take a picture before i stripped it)
This is it after stripping.
What i use is Iso-propyl Alcohol which is 99.9% pure. The higher the % figure the better the job it does and it will not harm the plastic.
You can get it from Ebay for about £7 for a litre bottle.
I get an air tight plastic box which is big enough to hold the cab, and pour in the entire bottle. Fit the lid and let it sit for about half an hour, after that turn it every now and then. After a couple of hours (depending on the type of paint used)it will be ready to remove the paint. I use an old tooth brush to gently rub the paint of, its that easy.
Once all the paint is removed, wash it with some soap and water.
The used alcohol can be strained through some coffee filter papers to remove the bigger bits of paint and put back into its bottle ready for the next time.
Hope this is of some help to someone.
Noel.