How to Make Old Paintbrushes Like New Sharing is caring!3KsharesShareTweetPinYummlyPrint Other Great Tips! How to Remove Grease and Oil From Clothing How to Make Fabric Softener Sheets How to Clean a Toilet with Coke Use Mayonnaise to Remove Water Marks on Wood How to Make Old Paintbrushes Like New Soak the stained paintbrushes in Murphey’s Oil for 24-48 hours and all the paint will dissolve off the brush, leaving it like new!