Careful with Simple Green and Monokote (and Econokote/Towerkote) If you mix it too strong it will start lifting the edges of the covering. It dissolves the adhesive! (quickly lifts the Towerkote edges at 10 parts water: 1 part Simple Green)

Almost any common spray cleaner CAN attack the iron-on covering adhesive if the edges are not sealed with a coat of clear gloss paint. (such as Lusterkote)