Never use alcohol, windex or baby wipes to clean your stamps or acrylic blocks. These chemicals will damage the product - if not immediately, over time.

You should promptly clean your acrylic stamp while still mounted on the block using a stamp cleansing spray and scrubber. Acrylic stamps can lose their tackiness over time, you can make them sticky again by hand cleaning with a tiny bit of dish washing detergent which will eliminate the dust and oil that causes the problem. Do not use this as a regular treatment, as it too can cause build up, but use sparingly.