The Makeup Brush Cleansing Shampoo by EcoTools is a fragrance-free and dermatologist-tested product that effectively cleans makeup brushes and sponges. Tara, the reviewer, finds it satisfying to see how well the shampoo cleans her brushes. She pours a little bit onto her brush plate, rubs it around, and is amazed at how easily the makeup comes off. She demonstrates the effectiveness of the shampoo on multiple brushes and highly recommends it. Overall, the EcoTools Makeup Brush Cleansing Shampoo is a reliable and efficient product that delivers impressive results, making it a must-have for anyone looking to keep their brushes clean and makeup-free.