Ultrasonic Cleaner for Invisalign Trays?

Step one is proper oral hygiene (I always tell my patients whatever you
have been doing up until starting invisalign for a fresh healthy
mouth... double it). Second is to NEVER eat or drink with your
aligners in place and try to brush or at minimum rinse with water after
snacking and eating.Step three is to go to the OAPCLEANER website and get a 3 month supply. This cleaner works great.I
have found, the best way to keep the aligners clean from bacteria,
viruses and fungi is with the use of a product called OAP Cleaner. OAP
provides instant cleaning of Invisalign and it takes only 60 seconds to
use. The carefully formulated, proprietary cleaning solution is
effective at cleaning and sanitizing all types of orthodontic
appliances. It has clinically been shown to kill 99.99% of all viruses,
bacteria, fungi and germs on contact. It also removes stains, plaque and
offensive odors. The use of a brush to scrub and rid these critters
and plaque off of your alignerstogether with OAP to sanitize and clean your aligner is the way to go.OAP
is BPA, persulfate and chlorine-free, and is completely safe to use on
Invisalign, as well as Invisalign storage containers. It is a gentle and
mild cleaning agent that won’t cause discoloration of the plastic or
result in abrasion of any surface material.

While there are many methods to clean the aligners, it may be overkill, as the aligners are only worn for 2 weeks at a time.  Long term appliances, like the Vivera retainers, can get discolored and usually are easily cleaned with a toothbrush and water.  Some have reported using denture cleaners, but I don't know the "official" line from Invisalign.

I recommend cleaning Invisalign trays with a toothbrush and toothpaste in cool water. An ultrasonic cleaner with the “crystals” that are suggested for use by Invisalign, work very well also.