I've done dawn; fells naptha; peroxide (which in straight straigtnght I have found to deteriorate fabric). I will mention the peroxide on the collar thing to him but I don't see thst lasting more than a day, if that, frankly. His cuffs and sleevesvare just general dirt. It really just annoys me that detergents that used to work no longer do. Used to be that i could rub wisk into a stain and it was gone. Unfortunately, no more. General laundry should not be this difficult! I will try everyone's suggestions.