Before cleaning your bong, you'll need to round up some supplies, including: a sink or basin; coarse salt, rice, or baking soda; rubbing alcohol, vinegar, or another cleaner; clean water; and latex gloves. While wearing your latex gloves, empty out your bong as well as you can. Pour out old bong water and remove any spent herb. Then give it a good rinse with warm water to remove any remaining solid particles. Finally, fill the bong part way with some of the warm water you're using. Take it apart so that the individual pieces can be cleaned. Remove all movable parts, including the pipe and mouthpiece. As you take your bong apart, check for any damage such as chips or cracks. You'll need to replace any damaged pieces before using your bong again. Next, you'll need to add an abrasive and a cleaner into the base of the bong so that they can work together to clean the inside. Coarse salt and isopropyl alcohol typically work best for this, but you can also use vinegar and rice or baking soda. Alternatively, you can use something like Formula 420, in which case skip the salt. Pour it in and proceed as normal. Use your hands, fingers, and thumbs to plug or block the open holes of the bong so that your abrasive and cleaner don't cause a big mess. Shake it for about five minutes to get the best possible result. Empty the cleaning solution into a sink and rinse it out completely with clean water. Repeat the cleaning process as many times as you need to, but once is usually enough.

TL;DR in Indonesian:
Sediakan perlengkapan. Kosongkan bong dan bilas serta isi dengan air hangat. Bongkar bong. Masukkan garam kasar dan alkohol gosok pada bong. Sumbat lubang dan kocok bong. Bilas dan ulangi.