Troubleshooting The SENSEO spatters when brewing with milk There may be several causes for milk froth spatters; below find some helpful tips to solve your problem. The milk you used was not cold enough. You may have used milk that is too warm. Make sure you use cold milk straight from the refrigerator (5-8 degrees). There is not enough milk. Make sure you have used enough milk The internal parts of the milk unit are dirty and have to be cleaned. Because you use fresh milk to prepare your coffee varieties with milk, it is essential that you keep the milk unit clean. A clean milk unit is essential to ensure good milk froth and proper hygiene.