Hi,

What is formula 49. It is commonly referenced in terms of model trains
in removal of decals. But I have never seen heard this name before.
Waht is it? Can you send me a link with a pic as well as your answer?
(ideally also a place I can buy it online) thanks

Hello.

I'm going to go out on a limb here and suggest that the solvent in
question is actually "Formula 409."  The documentation that you've
read likely contains a misprint.

See:
Formula 409
http://www.formula409.com/

Buy some on eBay:
http://search.ebay.com/search/search.dll?cgiurl=http%3A%2F%2Fcgi.ebay.com%2Fws%2F&fkr=1&from=R8&satitle=%22formula+409%22&category0=
Or via Froogle:
http://froogle.google.com/froogle_cluster?q=%22formula+409%22+%22all+purpose%22&pid=4777625502999651618&oid=6842128541854179679&btnG=Search+Froogle&lmode=&addr=&scoring=p&hl=en

-----------
search strategy:
"formula 409"

I hope this helps. If not, please let me know via the "request
clarification" feature.

Thanks, great answer

The best thing for removing stickers is a product called "Goo Gone." 
It's like $3 at the hardware store.

http://www.drugstore.com/qxp81908_333181_sespider/goo_gone/stain_remover.htm