Foam is an extremely porous and flexible material. It can be used to make pillows, mattress covers, yoga cubes, and blocks for children to play with. If you have are using foam blocks, you will need to know how to clean them.
Examine your foam blocks. If they have only a few spots to clean, you can get them out with dish soap and water. Mix a drop or two of dish soap with a cup of warm water.
Dip a white washcloth in the soapy water and rub this over the dirty spots on your foam blocks. The spots should come out easily. Set the block out so it can dry.
If your blocks are really dirty, or you need to clean more than one, turn on your washing machine and add laundry detergent. Put your foam blocks in the machine and wait for them to finish washing.
Set the foam blocks out to dry. It is preferable that you do not put the blocks in a dryer. If you do need to use the dryer, use the low heat setting.