Everything from a basic vinegar and water solution to a lightweight dish with warm soapy water can help. You can also use a diluted version of your standard multi-purpose dishwashing detergent. However, don’t use harsh chemicals to get rid of the bleach from these blocks since it’ll damage the wood to dry down. Here are the steps you need to take: Fill a bucket with water and immerse the unclean blocks in it. After scrubbing the blocks, quickly immerse them in water in another container. Wipe these clean blocks, with a dry cloth and allow them within the sunlight to dry completely. After that, please put them in an air-tight container and store them.