i would soak the 108 cut blocks in vinegar, as suggested, but outside, and then hand swish them in sudsy water. i like ivory flakes when i can find it or make your own with a potato peeler, or a gentle liquid hand soap. i would use hot water and do the reds separately. you don't know what you have there. then i would dry outside, laying them flat if possible. those blocks look familiar. look at my avatar.