You can try mineral spirits.I would not bother cleaning the brushes,though.If you want to use them later with the oil-based poly, you should put the brushes inside the plastic bag, wrap it tight and place the bag into the cold place(freezer would be a perfect spot).Do not put the back inside the fridge: all your food will smell like poly…
On 11.19.09, In Q&A, By Admin
considering the price between new brushes and paint brush cleaner i would not bother.
Don’t know what you have around the house, but Mineral Spirits will probably work well.
Mineral spirits will do the trick. Its quick, easy and cheap. Just put a little on a rag and scrub. Or, if its a lot of paint, fill an old coffee can 1/3 full with mineral spirits and soak the brushes in there overnight.
around the house? paint thinner, gas,( be very careful) if they are dried solid just toss and get new ones.