409 eats resin like kids eat candy too, and i'm sure is much less toxic/corrosive/safer then oven cleaner... if i've needed to clean resin (i usually scrape so i can smoke, but sometimes that's just not practical) i've always either used 409 or hot water/rubbing alcohol/salt combination... 409, spray it and let it sit for awhile, wash with warm soapy water afterwards, then rinse with more water, i like to use cold water if i'm about to smoke out of it (my bong tends to be kind of warm/hot after i wash it, if i'm going to smoke out of it, i want it cold as usual, so i rinse with cold water) if i'm not about to smoke, i'll use hot water again, as it evaporates faster...