Aluminium Downstem

Bongs:
When cleaning Bong start with removing all removeable pieces (cone pieces, stem, etc) then remove all water from bong. Pour strong alcohol (isopropyl alcohol, acetone, etc) into bong and add some salt. Seal top and bottom of bong with ziplock bags and rubber bands. Shake for 5 mins, remove seals and alcohol then rinse with water.

Pipes:

When cleaning a pipe start with filling a bag (container, box, etc) with strong alcohol (isopropyl alcohol, acetone, etc) and let it soak for up to an hr and occasional shaking pipe. Then rinse with water.