How to clean the inside of a bottle<br>Fill your bottle less than ¼ full with gravel or rice. If you choose rice, use raw, uncooked rice. If you choose gravel, choose a size in between sand and pea gravel.
Rice should always be fully cooked.
( z1 recommend :ARG1 ( z2 cook :ARG1 ( z3 rice ) :ARG1-of ( z4 full ) :time ( z5 always ) ) )