Glass Hanging

How do I clean nicotine from a 50 to 70′s era hanging hand painted glass lamp?
I recently inherited a Hanging Lamp that is somewhere between the 50′s and 70′s era. The people I inherited it from were heavy smokers for years, and as a result, the lamp is coated in nicotine. I’m not sure what I can use on it that won’t damage the paint on it. It is kind of iridescent with hand Painted Roses on it
The worst part of the lamp is that the roses are painted all over it and painted on the exterior. It’s a beautiful lamp, but I’m absolutely terrified of messing it up by cleaning it.
Pipe cleaner or alcohol be carfull though
DAVID BLAINE HANGING INSIDE A GLASS BOX IN LONDON FOR 44 DAYS!