Stop using turps to wash your brushes

Using solvents to clean your brushes strips moisture from the hair filaments.
Liquids tend to send pigment into the ferrel of your brush where they become lodged and cause the brush to lose its shape.
Using an oil or waxed based brush cleaner moisturises and conditions brushes increasing their longevity. These products can also re-wet and restore brushes left to dry by the artist with better things to do than clean up!

St. Luke recommends Langridge Safe-Clean