Like I said, brilliant plan, but there was a second problem. When you clean your brushes with household oil, they'll be, how do I say, kinda oily and not fit for painting use. She then thought of yet another plan (she's really smart), which was to remove the oil by washing the brushes with shampoo, if possible with conditioner.
The combination of oil and shampoo works miracles. My brushes are softer than ever and they don't wear out as fast as they used to. I have a number of water color brushes for example that I bought a few years ago and they're still in great shape. If I cleaned them with turpentine, they'd be in the trash for a long time.
Another advantage of this method is the re-use of the oil. I pour the used oil in an old bottle and let it rest for a few weeks. The pigment slowly sinks to the bottom, leaving a relatively clear oil, that I can use again. And again. I can go for months with just a bottle. Good for the environment too. It doesn't matter which oil or shampoo you use. I always buy mine from the bottom shelf in our local supermarket.
The only downside is I need a lot of brushes, because I can't clean them while I'm working. At least not like I used to with turpentine. I use a painting cloth and tissues to squeeze out the paint, but it usually doesn't take long before I have to take a fresh brush.
If you got to the end of this article, you really must be a painting aficionado. Thanks for bearing with me. Next time I'll talk about something really deep...