I typically clean my favorite glass at least twice a week. This is how I do it:
I take some 91% isopropyl alcohol and put it in a mug. I then take that mug (cover it) and pop it in the microwave for about 30-40 seconds. My next step is to pour the heated isopropyl into the glass and shake. I dump the alcohol out and let the rest evaporate. If the bong is really dirty I might run fresh isopropyl through it again. I then rinse the glass with hot water and presto! Good as new!
You might have friends who clean their glass with isopropyl and salt. This works but it can erode glass on pieces like a fritted disk perc (many shards of glass melted back together in a disk). One of my tubes has a fritted disk so I switched to the heated isopropyl method.
I just cleaned my inline tube and took these pictures. 👍
Before The Clean
Proceed To Make The Clean Bong Dirty 🔥
Packed with AK-47 (25.07% THC, 1.44% CBD)
Stay Lifted Friends!