Anti Fog for Sunglasses?

I have a pair of Costas and especially when it is hot and still, they fog up constantly.

Anyone have a suggestion for an anti-fog that really works to keep this from happening?

Thanks

I read washing glasses with dish soap works. Haven't tried it yet.

I used to have a product that I got at local boat shows years back. Worked great for my glasses I wore while riding motorcycle. It came ina small container (round) like that lip
Balm stuff. Had black and orange/red label on it.
Applied it then wiped clean. Easy in. Worked great.

I can remember all that but not the darn name. Moved few months back and pretty sure I threw it out. Will
Check and post picture if I locate it.

Optic 55 is great for anti fog on sunglasses, car windows, anything glass or poly carbonate, cost around $9.00

Scuba divers have used plain old spit for decades.

That is one of the reasons I prefer Oakley's over Costa's.

One of the products made for dive masks will work and a lot of people also use shaving cream to help.

I haven’t tried it but saw on the news a dive shop said that 5 parts name brand baby shampoo, 4 parts Dawn dishwashing liquid and 1 part water is what they used. Said that name brand baby shampoo worked better than the cheap stuff

Pure white bar soap