Wool does Not like Detergent.
All my felt creations may be placed in lukewarm water with a small amount of soap. Leave for a few minutes then rinse well in the same temperature water, ensuring all soap is removed.
Squeeze out excess water, DO NOT WRING. Reshape and hang or lay to dry.
Iron on wool or silk setting while still damp.
I always use a bar of Olive oil soap which you can get from health food shops, You can use washing up liquid like Fairy or Dawn. (Just a drop).
Enjoy wearing your Felt creation.
This method may also be used for Yarn.