Chris - Although you have not been specific on the model of frontload washer you have I would advise extreme caution before using this product in a front load washer that has an aluminium spider connecting the inner drum to the drive chain. I do not know of a front loader readily available in N. America that does not use an aluminium alloy spider. The MSDS (Material Safety Data Sheet) put out by Church and Dwight, the manufactuer's of OxiClean is available at the link below. You will note that the main ingredients of this product are sodium carbonate (otherwise known as washing soda) and sodium percarbonate. When water is added to sodium percarbonate it reacts to form hydrogen peroxide, which is the actual cleaner, and sodium carbonate. Sodium carbonate is very corrosive to aluminium and its alloys. In fact the MSDS notes that OxiClean 'as is' in a 1% solution has a pH value of 10.5. Now as a generalisation the engineering and scientific community accept that corrosion of aluminium and its alloys will commence when it is mmersed in an aqueous solution with a pH value above about 8.0. The highest value I have seen quoted is 9.0. Add to that sodium carbonate is hygroscopic so leaving the door open on the washer to allow it to dry out will in fact allow atmospheric moisture in to keep any sodium carbonate remaining damp. Further the MSDS notes that OxiClean is not stable in the presence of reducing agents, aluminium is a reducing agent. Make you own choices but please be aware of the possible consequences of your actions. By the way sodium hypochlorite (bleach) is also very corrosive to aluminium.