With your body flat (horizontal), put your index and middle finger on the mask face edge, slightly above the nose bridge. Now, pressing firmly with those fingers and at the same time, exhaling briskly and fully out your nose, you also tilt your head back. That should work if I've explained it properly.
There may still be a bit of water remaining in the very bottom of your mask windows near your nostrils. Some folk find this annoying and it can be but it isn't a big deal.
If your body is vertical in the water, head up towards the surface, then tuck chin to chest, fingers as explained, exhale through nose as explained at same time as tipping head as far back as you can as if looking up to the surface.
Eventually, it will not be neccessary to be so dramatic in your movements, as clearing becomes more natural.
Also, make sure that your mask strap is properly positioned.
The reason that you are pressing the top of your mask is to lightly unseal the bottom of your mask so that the air you are exhaling forces the water out the bottom and then neatly reseals to your cheeks and below nose/above lip.
If your mask skirt on bottom of mask opens up too far then water will come back in if you stop exhaling prior to a proper reseating.
There may still be a bit of water remaining in the very bottom of your mask windows near your nostrils. Some folk find this annoying and it can be but it isn't a big deal.
If your body is vertical in the water, head up towards the surface, then tuck chin to chest, fingers as explained, exhale through nose as explained at same time as tipping head as far back as you can as if looking up to the surface.
Eventually, it will not be neccessary to be so dramatic in your movements, as clearing becomes more natural.
Also, make sure that your mask strap is properly positioned.
The reason that you are pressing the top of your mask is to lightly unseal the bottom of your mask so that the air you are exhaling forces the water out the bottom and then neatly reseals to your cheeks and below nose/above lip.
If your mask skirt on bottom of mask opens up too far then water will come back in if you stop exhaling prior to a proper reseating.