I soak my Aerobika in warm or hot water with Seventh Generation dish soap after each use. I did not know NJH recommended Seventh Generation but that is what I "felt" would be best. I rinse well and even do a final rinse using water from the Lifestraw pitcher. Then shake out any water and dry on paper towels. Then once a week on Sunday, after the usual dish soap soak and rinse, I ALSO soak in alcohol for 5 minutes and rinse. I do the same with my sprint nebulizer cups except I do the alcohol after three treatments. I have two sets of Aerobika and Sprint cups. One for morning and one for evening treatments. This way I can make sure they are perfectly dry before use.