The best way to keep clear aligners clean is to scrub them twice daily with a medium or firm bristled toothbrush under cold or warm (not hot) water. Ensure you scrub both the inside and outside of the aligners. If you have AlignerBright foam you can also use that in your aligners as it both whitens your smile and sanitises your aligners. If not you can soak them in either white (not brown) vinegar or Milton’s Solution (ie. diluted bleach 1 part and 9 parts water) used for disinfecting baby’s bottles.