Does it clean old oil paints left on the brush, I have just started using the water mixable oils as I have perpetual hay fever and trying to get rid of old oil paints without ruining the brush is difficult?
Cleaning dried on paint from brushes can be difficult. A good brush cleaner is an essential part of the artists tool kit.
Brush cleaners have been developed to not only clean the brushes thoroughly getting all the pigment out f the hairs and ensuring the paint is removed from the ferrule where it tends to build up, but they are designed to condition and restore the hair.
I the Brush Cleaner and Preserver does say that it will clean brush what ever the mediums and even if they are dried on, so it is worth trying. I like using the hard soap like constancy brush cleaner for cleaning brushes
Alternatively, I have seen good reviews for the Winsor & Newton Brush Cleaner in that it will also clean dried on paint. This is a liquid and you could soak you brushes to help remove the dried-on paint.