Thanks for answering. So many talks about polarizing filters brought to mind something different:Besides PBD's usage, I use wide angle CPLs to reduce reflections for waterfalls. Taking shots with and without but generally using the shot with CPL as looking through the water in pool of the waterfall (flat water not turbulent) is better than reflections. Reflections on wet rocks within the waterfall show up as harsh lighting.
Seascapes on rock shelves is another example. Use no CPL for cloud reflections on puddles on the rocks or ocean pools or CPL when you want to show what is in the rock pools. If it is overcast then there are no blue sky issues to use CPL for wide angle shots. If the skies are clear, there is no point to shoot a sunrise from my perspective
That I hadn't thought of bringing a polarizing filter for shooting some small amphibians! In the best case the water was so swallow that it practically didn't matter but that was stupid of me. I am not going there again most probably. I have a normal - not 4x4 - car and I drove about 18 kilometers (and then back) of a bumpy rocky road. So it could be a disaster (Initially I was thinking that word for the shooting but it can easily apply to driving too )
Interesting thing I have a polarizer (77mm ... I think!) but I do not bring it with me the last few years. That should change. It is small and light and can fit easily to the bag (...probably with a step ring too).