try 409....i swear to god that shit just eats resin away...and all other grime....i can get my pipe totallly resinated scrape all that's good then soak it over night in full strength 409 and then use some q-tips the next day and just wipe away all the gunk...looks brand new..works with bongs too....just make sure it's filled all the way up and have some kind of baby bottle cleaner or somthing to do some mild scraping then rinse and this is important.....wash afterwards no matter what you soak in liquid dish soap. HAND WASHING ONLY seeming as i don't know how bongs and pipes will hold up in a washing machine but 409 will leave a very unwanted, untasteful, and very sickening residue