Specs steam up with dustmask andor goggles

Have you tried valved types? Something like these

I find goggles often mist up whether I'm wearing a mask or not.

Perhaps try some safety glasses. These ones allow room for specs underneath.

That's life. Use ones with as much ventilation as is safe for the job. Pull them away the face briefly frequently.

NT

The advice for ski goggles used to be to rub them with a cut potato - might be worth trying. I use a face shield which doesn't cause steaming-up

Misting of glasses under goggles was a problem in my motorcycling days before full face helmets. Wiping both sides of the glasses with a dilute solution either of soap or washing up detergent was a partial solution. Follow up by polishing with cotton cloth.

Well this has to be due to a temperature difference. After all when the temperature drops the moisture condenses out onto the colder surface as cold air holds less moisture. If this is the case then either you are sweating a lot or working in a very cold place. The usual fix but you can hardly do much about it in a mask is to let more air flow around. Brian

I've had that problem - solved with a 3M 4000 mask. Expensive but makes everything so much easier. And, I suspect, they actually work.

No steaming problems with the 3M half mask respirators:

For goggles, you could try a full face visor.