u/mswmark

my old piece used to get dirty just like every piece i owned in my life. unfortunately i dropped it the other day and it shattered, i got a new piece to replace it and now the only thing that gets dirty is the down stem, its like the bong has a non stick coating to prevent it from building up rez??? any information or insight would be appreciated. i’m wondering if its safe to clean it with iso?? i haven’t had to yet i just take the down stem out and rinse with soap and hot water and everything comes right out and it looks like brand new clean glass