Styroflex caps / washing the Anushri board

I’ve just populated the main board and it’s struck me that I didn’t consider whether the styroflex caps on the Anushri main board are waterproof.

It’s standard practice for me to wash the flush off any PCB I make, but I don’t want to desolder the styroflex caps to do this as they seem very delicate.

Does anyone happen to know if the package for these caps is waterproof?