ICECREAM FOR YOUR SOLES horse hair brush works nicely on delicates
https://icecreamforyoursoles.com/product/icecream-for-your-soles-ultra-premium-brushes-dual-pack/
I used icecream For Your Soles on a couple of my kicks now. The sauce is thick, and easier to apply and not thin and runny.
https://icecreamforyoursoles.com/product/icecream-for-your-soles-8oz-clear-soles/