Some artists paint with oils without turpentine or with no oil painting media and no Turpentine to thin the oils ... just the oils straight out of the tube. It’s ok but the painting won’t last a hundred years

Sites that discuss media and thinners and more materials used in oil painting:

http://www.a-state-of-change.com/OilPainting-Medium.html

http://www.lmhornberger.com/atoil.htm
 

Oil Painting Medium

Drying Oils

Linseed oil

Poppy oil

Walnut oil

Thinners (Solvents)

Turpentine

Turpenoid Natural

Mineral spirits

Spike of Lavender
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Cleanup:

1. The easy way; set up a cup of Baby Oil (the stuff you buy in Drug Stores or Supermarkets) , dip your brushes with oil paints in the cup and wipe the brush with newspaper or an old 0phone books to remove as much of the oil paints as possible several times on multiple pages till as much is removed as you can. Then use soap (household or art supply store brush cleaning soap) to fully clean the brush. The set the brush someplace where the brush area is not under pressure.

2. Some artists use Baby Wipes to clean brushes.

3. Some artists use Art Supply store bought Brush Cleaning Tanks and Brush Cleaning Fluid (like those below from Dick Blick (click on the Dick Blick logo to order them).

   Video shows Silicoil Tank and Fluid use: http://www.youtube.com/watch?v=1CvTMppU6jc
    

   Silicoil Brush  Cleaning Tank

   Silicoil Brush  Cleaning Fluid

4. Final cleanup can be achieved with newspapers, phone books, rags and soap.

See this page: http://emptyeasel.com/2007/01/26/how-to-clean-your-paint-brushes-after-oil-painting/

I use Masters Brush Cleaner & Preserver (image below) ... available from Dick Blick at: http://www.dickblick.com/products/the-masters-brush-cleaner-and-preserver/