bleach takes a while (1 to 2 days)and sometimes it won't take it off all the way..Easy Off oven cleaner works great..i have been using it over 30 + years..just do it in a vented area and wear gloves..in about hrs or so wash off in warm water and scrub with old tooth brush then if it don't all come off DRY IT and spray again..it also works great on removing paint , just takes a while longer..the only problem i had was i left it on to long and it kinda etched the plastic..and also remember all plastic is not the same and the older the paint the longer it takes..