Can I use Flex Foaming Wash on other silicone menstrual cups? Zori April 08, 2021 21:04 Updated Follow Yes! Our wash is safe to use on any silicone menstrual cup. If you have any additional questions, reach out to us at here. Related articles How do I use the Flex Foaming Cup Wash to clean my Flex Cup? Can I use Flex Foaming Cup Wash on my body? Flex Cup size selection Can I wear Flex Cup for longer than 12 hours? Can I travel with Flex Foaming Cup Wash? Comments 0 comments Article is closed for comments.