To experiment with the working properties of the method discussed, I executed the above painting in the studio. I did use a small amount of Gamsol in the beginning stages of my painting to adhere to the fat-over-lean principle of painting in oils. But I can carry this in a small container (a repurposed bottle no larger than an eyedropper that it once held my Argan face oil) to squirt out a just little onto my palette for whatever small amount of thin washes I may need. After that point, though, I paint with mostly just paint, maybe using the solvent free gel to get a little bit of slip in my stroke when needed, but mostly for cleaning off my brushes between strokes.
For clean-up on site, I wipe my brushes clean with the medium, maybe with one last squirt of Gamsol from my little bottle, before packing everything up . The final clean up takes place back in the studio. Different artists use different things to wash their brushes, from Murphy's Oil Soap to baby oil to plain old soap and water. I've used these too, but my favorite is Master's Brush Cleaner. This stuff comes in a tub and lasts forever. I can't even remember when I bought my current tub and I'm only about 1/3 of the way through. I just wet my brushes, swish them around in the tub, and the remaining paint is easily washed out under water. Something about this stuff seems to really get the oil residue off of the bristles and condition them at the same time. I don't know what's in that magic tub, and I'm not sure I want to know. But it seems pretty innocuous, though I always wear my gloves now when handling my art materials.
I'm really happy to be reunited with my traditional oil paints. I still like the water miscible oils, but it's hard to shake that first love, and now, it seems, I don't have to.